[yugabyte#25158] YSQL: Disable TestPgRegressContribPostgresFdw

Summary:
TestPgRegressContribPostgresFdw has been failing since the pg15 merge (eac5ed5).

To avoid wasting time on a test that we know will fail, just disable it for now until we can properly fix it (yugabyte#24296).
Jira: DB-14321

Test Plan:
Jenkins: test regex: .*TestPgRegressContribPostgresFdw.*

```
 ./yb_build.sh --java-test TestPgRegressContribPostgresFdw
```

```
[INFO] -------------------------------------------------------
[INFO]  T E S T S
[INFO] -------------------------------------------------------
[INFO] Running org.yb.pgsql.TestPgRegressContribPostgresFdw
[WARNING] Tests run: 1, Failures: 0, Errors: 0, Skipped: 1, Time elapsed: 0.74 s - in org.yb.pgsql.TestPgRegressContribPostgresFdw
[INFO]
[INFO] Results:
[INFO]
[WARNING] Tests run: 1, Failures: 0, Errors: 0, Skipped: 1
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  6.406 s
[INFO] Finished at: 2024-12-03T20:03:41Z
[INFO] ------------------------------------------------------------------------
```

Reviewers: smishra, kramanathan, jason

Reviewed By: jason

Subscribers: yql

Differential Revision: https://phorge.dev.yugabyte.com/D40441

java/yb-pgsql/src/test/java/org/yb/pgsql/TestPgRegressContribPostgresFdw.java

@@ -12,6 +12,7 @@
 //
 package org.yb.pgsql;
 
+import org.junit.Ignore;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.yb.client.TestUtils;
@@ -26,6 +27,7 @@ public int getTestMethodTimeoutSec() {
     return 1800;
   }
 
+  @Ignore("#24296")
   @Test
   public void schedule() throws Exception {
     runPgRegressTest(new File(TestUtils.getBuildRootDir(), "postgres_build/contrib/postgres_fdw"),