RFR: 8307311: Timeouts on one macOS 12.6.1 host of two Swing JTableHeader tests

[Prasanta Sadhukhan]

Issue was bug6889007.java was causing a timeout issue on mac system.  Although bug6889007.java fail with small test group with "Wrong cursor type" error, it could not reproduce bug6884066.java 
It might be due to waitForIdle() being called in loop which will be calling sync() so replaced with delay..

Modified fix passed the suggested small test group `desktop_timeout ` several times in all platforms 
in addition to several iterations of the test run in standalone mode in all platforms..

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Commit messages:
 - 8307311: Timeouts on one macOS 12.6.1 host of two Swing JTableHeader tests

Changes: https://git.openjdk.org/jdk/pull/14026/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14026&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8307311
  Stats: 4 lines in 1 file changed: 3 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/14026.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14026/head:pull/14026

PR: https://git.openjdk.org/jdk/pull/14026