RFR: 8367784: java/awt/Focus/InitialFocusTest/InitialFocusTest1.java failed with Wrong focus owner

[Prasanta Sadhukhan]

Test was deproblemlisted in https://github.com/openjdk/jdk/pull/27136 without any modifications as it was passing in testing.
Since it again failed, added the execution in EDT to be more thread-safe.

Fix is tested against several CI jobs each with several iterations link of which is in JBS

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Commit messages:
 - 8367784: ava/awt/Focus/InitialFocusTest/InitialFocusTest1.java failed with Wrong focus owner

Changes: https://git.openjdk.org/jdk/pull/27332/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27332&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367784
  Stats: 23 lines in 1 file changed: 11 ins; 1 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/27332.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27332/head:pull/27332

PR: https://git.openjdk.org/jdk/pull/27332