[jdk21u-dev] RFR: 8315726: Open source several AWT applet tests

[Andrew Lu]

I backport this for parity with 21.0.3-oracle.

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Commit messages:
 - Backport 1741d13b1260253d1e299e8da9c42b5519a7ae48

Changes: https://git.openjdk.org/jdk21u-dev/pull/275/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=275&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315726
  Stats: 849 lines in 4 files changed: 849 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/275.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/275/head:pull/275

PR: https://git.openjdk.org/jdk21u-dev/pull/275