fix: cloudwatch control message makes consumelogs crash with sigsegv (#44231)

#### Description

With following config:

```
receivers:
  awss3:
    s3downloader:
        region: "ca-central-1"
        s3_bucket: "<redacted>"
    encodings:
      - extension: awslogs_encoding/cloudwatch
    sqs:
      queue_url: "<redacted>"
      region: "ca-central-1"

exporters:
  nop:

service:
  extensions: [awslogs_encoding/cloudwatch]
  pipelines:
    logs/aws:
      receivers: [awss3]
      processors: []
      exporters: [ nop ]

extensions:
  awslogs_encoding/cloudwatch:
    format: cloudwatch
```

And this kind of message in the bucket (gzip in bucket btw)

```
{
    "messageType": "CONTROL_MESSAGE",
    "owner": "CloudwatchLogs",
    "logGroup": "",
    "logStream": "",
    "subscriptionFilters": [],
    "logEvents": [
        {
            "id": "",
            "timestamp": 1763029869851,
            "message": "CWL CONTROL MESSAGE: Checking health of destination Firehose."
        }
    ]
}{
    "messageType": "DATA_MESSAGE",
    "owner": "0000000000000",
    "logGroup": "/this/is/a/log/group",
    "logStream": "this-is-a-log-stream",
    "subscriptionFilters": [
        "EksToS3"
    ],
    "logEvents": [
        {
            "id": "000000000000011111111111111111122222222222222222233333333333333333",
            "timestamp": 1763029869386,
            "message": "dummy message",
            "extractedFields": {
                "@aws.account": "0000000000000",
                "@aws.region": "ca-central-1"
            }
        }
    ]
}
```

I got the following issue

```
[signal SIGSEGV: segmentation violation code=0x1 addr=0x4 pc=0xbbac4a]

goroutine 125 [running]:
go.opentelemetry.io/collector/pdata/internal.(*State).IsReadOnly(...)
        go.opentelemetry.io/collector/[email protected]/internal/state.go:53
go.opentelemetry.io/collector/pdata/plog.Logs.IsReadOnly(...)
        go.opentelemetry.io/collector/[email protected]/plog/logs.go:13
go.opentelemetry.io/collector/internal/fanoutconsumer.(*logsConsumer).ConsumeLogs(0xc000645260, {0x2d23670, 0xc0005760a0}, {0x0?, 0x0?})
        go.opentelemetry.io/collector/internal/[email protected]/logs.go:61 +0x1ea
github.com/open-telemetry/opentelemetry-collector-contrib/receiver/awss3receiver.(*logsReceiver).processReceivedData(0xc000446590, {0x2d23670, 0xc0005760a0}, 0xc000280a20, {0xc0001d7860, 0x57}, {0xc001578000, 0x9b07c, 0xac000})
        github.com/open-telemetry/opentelemetry-collector-contrib/receiver/[email protected]/receiver.go:262 +0x6c7
github.com/open-telemetry/opentelemetry-collector-contrib/receiver/awss3receiver.(*awss3Receiver).receiveBytes(0xc000280a20, {0x2d23670, 0xc0005760a0}, {0xc0001d7860, 0x57}, {0xc001578000, 0x9b07c, 0xac000})
        github.com/open-telemetry/opentelemetry-collector-contrib/receiver/[email protected]/receiver.go:138 +0x253
github.com/open-telemetry/opentelemetry-collector-contrib/receiver/awss3receiver.(*s3SQSNotificationReader).readAll(0xc000572ae0, {0x2d23670, 0xc0005760a0}, {0x2d70d98?, 0x23233c0?}, 0xc000518000)
        github.com/open-telemetry/opentelemetry-collector-contrib/receiver/[email protected]/s3sqsreader.go:208 +0x1939
github.com/open-telemetry/opentelemetry-collector-contrib/receiver/awss3receiver.(*awss3Receiver).Start.func1()
        github.com/open-telemetry/opentelemetry-collector-contrib/receiver/[email protected]/receiver.go:106 +0x8a
created by github.com/open-telemetry/opentelemetry-collector-contrib/receiver/awss3receiver.(*awss3Receiver).Start in goroutine 1
        github.com/open-telemetry/opentelemetry-collector-contrib/receiver/[email protected]/receiver.go:105 +0x14c
```

Changing to proper logs initialization fix the issue

---------

Signed-off-by: Jean-Yves NOLEN <[email protected]>
Co-authored-by: Alex Boten <[email protected]>
Co-authored-by: Antoine Toulme <[email protected]>
Co-authored-by: Christos Markou <[email protected]>

Author: 4 people

.chloggen/44231-awsencoding-fix-segv.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: 'bug_fix'
+
+# The name of the component, or a single word describing the area of concern, (e.g. receiver/filelog)
+component: extension/awslogs_encoding
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: address the SIGSEGV occurring when processing control_message messages.
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [44231]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []

extension/encoding/awslogsencodingextension/internal/unmarshaler/subscription-filter/testdata/valid_cloudwatch_log_control.json

@@ -0,0 +1,16 @@
+{
+    "messageType": "CONTROL_MESSAGE",
+    "owner": "CloudwatchLogs",
+    "logGroup": "log_group_name",
+    "logStream": "log_stream_name",
+    "subscriptionFilters":[
+        "subscription_filter_name"
+    ],
+    "logEvents": [
+        {
+            "id": "",
+            "timestamp": 1763029869851,
+            "message": "CWL CONTROL MESSAGE: Checking health of destination Firehose."
+        }
+    ]
+}

extension/encoding/awslogsencodingextension/internal/unmarshaler/subscription-filter/testdata/valid_cloudwatch_log_control_expected.yaml

@@ -0,0 +1 @@
+resourceLogs: []

extension/encoding/awslogsencodingextension/internal/unmarshaler/subscription-filter/unmarshaler.go

@@ -68,7 +68,7 @@ func (f *subscriptionFilterUnmarshaler) UnmarshalAWSLogs(reader io.Reader) (plog
 	}
 
 	if cwLog.MessageType == "CONTROL_MESSAGE" {
-		return plog.Logs{}, nil
+		return plog.NewLogs(), nil
 	}
 
 	if err := validateLog(cwLog); err != nil {

extension/encoding/awslogsencodingextension/internal/unmarshaler/subscription-filter/unmarshaler_test.go

@@ -117,6 +117,10 @@ func TestUnmarshallCloudwatchLog_SubscriptionFilter(t *testing.T) {
 			reader:               readAndCompressLogFile(t, filesDirectory, "valid_cloudwatch_log.json"),
 			logsExpectedFilename: "valid_cloudwatch_log_expected.yaml",
 		},
+		"valid_cloudwatch_log_control": {
+			reader:               readAndCompressLogFile(t, filesDirectory, "valid_cloudwatch_log_control.json"),
+			logsExpectedFilename: "valid_cloudwatch_log_control_expected.yaml",
+		},
 		"invalid_cloudwatch_log": {
 			reader:      readAndCompressLogFile(t, filesDirectory, "invalid_cloudwatch_log.json"),
 			expectedErr: "invalid cloudwatch log",