[jdk21u-dev] RFR: 8354248: Open source several AWT GridBagLayout and List tests

[Satyen Subramaniam]

Backporting JDK-8354248: Open source several AWT GridBagLayout and List tests. Adds a GridBagLayout and two List tests. Ran GHA Sanity Checks, local Tier 1 and 2, and new tests directly. Patch is clean. Backporting for parity with Oracle.

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Commit messages:
 - Backport 6a310613392b9d619ae1bbe3e663cb4a022165d9

Changes: https://git.openjdk.org/jdk21u-dev/pull/2265/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2265&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8354248
  Stats: 368 lines in 4 files changed: 368 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2265.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2265/head:pull/2265

PR: https://git.openjdk.org/jdk21u-dev/pull/2265