[jdk21u-dev] RFR: 8315965: Open source various AWT applet tests

[Andrew Lu]

I backport this for parity with 21.0.5-oracle.

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Commit messages:
 - Backport 3b397c8552d7fd1b1084fbbc06384f3f34481ba4

Changes: https://git.openjdk.org/jdk21u-dev/pull/908/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=908&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315965
  Stats: 546 lines in 4 files changed: 546 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/908.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/908/head:pull/908

PR: https://git.openjdk.org/jdk21u-dev/pull/908