[SPARK-26744][SPARK-26744][SQL][HOTFOX] Disable schema validation tes…

…ts for FileDataSourceV2 (partially revert )

## What changes were proposed in this pull request?

This PR partially revert SPARK-26744.

apache@60caa92 and apache@4dce45a were merged at similar time range independently. So the test failures were not caught.

- apache@60caa92 happened to add a schema reading logic in writing path for overwrite mode as well.

- apache@4dce45a added some tests with overwrite modes with migrated ORC v2.

And the tests looks starting to fail.

I guess the discussion won't be short (see apache#23606 (comment)) and this PR proposes to disable the tests added at apache@4dce45a to unblock other PRs for now.

## How was this patch tested?

Existing tests.

Closes apache#23828 from HyukjinKwon/SPARK-26744.

Authored-by: Hyukjin Kwon <gurwls223@apache.org>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>

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

@@ -334,7 +334,7 @@ class FileBasedDataSourceSuite extends QueryTest with SharedSQLContext with Befo
   test("SPARK-24204 error handling for unsupported Interval data types - csv, json, parquet, orc") {
     withTempDir { dir =>
       val tempDir = new File(dir, "files").getCanonicalPath
-      Seq(true, false).foreach { useV1 =>
+      Seq(true).foreach { useV1 =>
         val useV1List = if (useV1) {
           "orc"
         } else {
@@ -379,7 +379,7 @@ class FileBasedDataSourceSuite extends QueryTest with SharedSQLContext with Befo
   }
 
   test("SPARK-24204 error handling for unsupported Null data types - csv, parquet, orc") {
-    Seq(true, false).foreach { useV1 =>
+    Seq(true).foreach { useV1 =>
       val useV1List = if (useV1) {
         "orc"
       } else {