[jdk21u-dev] RFR: 8185429: [macos] After a modal dialog is closed, no window becomes active

[Satyen Subramaniam]

Backporting JDK-8185429: [macos] After a modal dialog is closed, no window becomes active. Add a check for previous focused window on modal unblocking. If the owner of a closing dialog was the last focused window, then the owner of the dialog should regain focus. Removing relevant test from problem list. Ran GHA Sanity Checks, local Tier 1 and 2, and adjusted test directly. Patch is clean. Backporting for parity with Oracle.

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Commit messages:
 - Backport 3a26bbcebc2f7d11b172f2b16192a3adefeb8111

Changes: https://git.openjdk.org/jdk21u-dev/pull/2021/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2021&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8185429
  Stats: 8 lines in 2 files changed: 6 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2021.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2021/head:pull/2021

PR: https://git.openjdk.org/jdk21u-dev/pull/2021