fix(internal/librarian/dart): remove key prefix when building sidekick config (#3787)

Remove `prefix:` and `proto:` when building sidekick config. These
prefix is already there in `.sidekick.toml`.

For #3580

Author: JoeWang1127

internal/librarian/dart/generate.go

@@ -128,10 +128,10 @@ func buildCodec(library *config.Library) map[string]string {
 		codec[key] = value
 	}
 	for key, value := range dart.Prefixes {
-		codec["prefix:"+key] = value
+		codec[key] = value
 	}
 	for key, value := range dart.Protos {
-		codec["proto:"+key] = value
+		codec[key] = value
 	}
 	return codec
 }

internal/librarian/dart/generate_test.go

@@ -254,8 +254,8 @@ func TestBuildCodec(t *testing.T) {
 			library: &config.Library{
 				Dart: &config.DartPackage{
 					Prefixes: map[string]string{
-						"google.protobuf": "pb",
-						"google.api":      "api",
+						"prefix:google.protobuf": "pb",
+						"prefix:google.api":      "api",
 					},
 				},
 			},
@@ -269,8 +269,8 @@ func TestBuildCodec(t *testing.T) {
 			library: &config.Library{
 				Dart: &config.DartPackage{
 					Protos: map[string]string{
-						"google.api":      "package:google_cloud_api/api.dart",
-						"google.protobuf": "package:protobuf/protobuf.dart",
+						"proto:google.api":      "package:google_cloud_api/api.dart",
+						"proto:google.protobuf": "package:protobuf/protobuf.dart",
 					},
 				},
 			},
@@ -300,10 +300,10 @@ func TestBuildCodec(t *testing.T) {
 						"package:googleapis_auth": "^2.0.0",
 					},
 					Prefixes: map[string]string{
-						"google.protobuf": "pb",
+						"prefix:google.protobuf": "pb",
 					},
 					Protos: map[string]string{
-						"google.api": "package:google_cloud_api/api.dart",
+						"proto:google.api": "package:google_cloud_api/api.dart",
 					},
 				},
 			},
@@ -460,20 +460,20 @@ func TestToSidekickConfig(t *testing.T) {
 					"googleapis-root": googleapisDir,
 				},
 				Codec: map[string]string{
-					"api-keys-environment-variables":    "GOOGLE_API_KEY",
-					"dependencies":                      "dep-1,dep-2",
-					"dev-dependencies":                  "dev-dep-1,dev-dep-2",
-					"extra-imports":                     "extra-imports",
-					"issue-tracker-url":                 "https://tracker/issues",
-					"library-path-override":             "library-path-override",
-					"not-for-publication":               "false",
-					"package:googleapis_auth":           "^2.0.0",
-					"part-file":                         "part-file",
-					"prefix:prefix:google.logging.type": "logging_type",
-					"proto:proto:google.api":            "package:google_cloud_api/api.dart",
-					"readme-after-title-text":           "readme-after-title-text",
-					"readme-quickstart-text":            "readme-quickstart-text",
-					"repository-url":                    "https://github.com/googleapis/google-cloud-dart",
+					"api-keys-environment-variables": "GOOGLE_API_KEY",
+					"dependencies":                   "dep-1,dep-2",
+					"dev-dependencies":               "dev-dep-1,dev-dep-2",
+					"extra-imports":                  "extra-imports",
+					"issue-tracker-url":              "https://tracker/issues",
+					"library-path-override":          "library-path-override",
+					"not-for-publication":            "false",
+					"package:googleapis_auth":        "^2.0.0",
+					"part-file":                      "part-file",
+					"prefix:google.logging.type":     "logging_type",
+					"proto:google.api":               "package:google_cloud_api/api.dart",
+					"readme-after-title-text":        "readme-after-title-text",
+					"readme-quickstart-text":         "readme-quickstart-text",
+					"repository-url":                 "https://github.com/googleapis/google-cloud-dart",
 				},
 			},
 		},