[MINOR][SQL][TESTS] Check file based V2 datasources on unsupported types

### What changes were proposed in this pull request?
In the PR, I propose to modify `FileBasedDataSourceSuite` and check V2 datasources: JSON/CSV, ORC, Parquet on the unsupported data types: intervals and null. And remove TODOs.

### Why are the changes needed?
To extend test coverage.

### Does this PR introduce _any_ user-facing change?
No.

### How was this patch tested?
By running the modified test suites:
```
$ build/sbt "test:testOnly *FileBasedDataSourceSuite"
```

### Was this patch authored or co-authored using generative AI tooling?
No.

Closes #50356 from MaxGekk/time-off-fs-ds.

Authored-by: Max Gekk <[email protected]>
Signed-off-by: Hyukjin Kwon <[email protected]>

Author: MaxGekk

sql/core/src/test/scala/org/apache/spark/sql/FileBasedDataSourceSuite.scala

@@ -503,8 +503,7 @@ class FileBasedDataSourceSuite extends QueryTest
   test("SPARK-24204 error handling for unsupported Interval data types - csv, json, parquet, orc") {
     withTempDir { dir =>
       val tempDir = new File(dir, "files").getCanonicalPath
-      // TODO: test file source V2 after write path is fixed.
-      Seq(true).foreach { useV1 =>
+      Seq(true, false).foreach { useV1 =>
         val useV1List = if (useV1) {
           "csv,json,orc,parquet"
         } else {
@@ -572,8 +571,7 @@ class FileBasedDataSourceSuite extends QueryTest
   }
 
   test("SPARK-24204 error handling for unsupported Null data types - csv, parquet, orc") {
-    // TODO: test file source V2 after write path is fixed.
-    Seq(true).foreach { useV1 =>
+    Seq(true, false).foreach { useV1 =>
       val useV1List = if (useV1) {
         "csv,orc,parquet"
       } else {