RFR: 8288471: java/awt/ScrollPane/bug8077409Test.java is unstable and fails intermittently in CI

[Manukumar V S]

java/awt/ScrollPane/bug8077409Test.java is unstable and fails intermittently in CI, especially in MacOS machines.
Also the frame created in this test is not disposed which may interfere with other tests.

Fix:
Some stabilisations added and the frame is disposed properly.

Testing:
Tested 100 times per platform(macosx-x64,macosx-aarch64,windows-x64,linux-x64) and got all PASS.

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Commit messages:
 - 8288471: java/awt/ScrollPane/bug8077409Test.java is unstable and fails intermittently in CI

Changes: https://git.openjdk.org/jdk/pull/24292/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24292&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8288471
  Stats: 50 lines in 1 file changed: 24 ins; 2 del; 24 mod
  Patch: https://git.openjdk.org/jdk/pull/24292.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24292/head:pull/24292

PR: https://git.openjdk.org/jdk/pull/24292