[jdk21u-dev] RFR: 8328753: Open source few Undecorated Frame tests

[Goetz Lindenmaier]

I backport this for parity with 21.0.6-oracle.

I include follow-up fix JDK-8337886.

Tests pass.

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Commit messages:
 - Backport follow-up 8337866
 - Backport db159149c1c13a98ee9a85750741c6a3cd39f408

Changes: https://git.openjdk.org/jdk21u-dev/pull/1228/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1228&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328753
  Stats: 350 lines in 3 files changed: 350 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1228.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1228/head:pull/1228

PR: https://git.openjdk.org/jdk21u-dev/pull/1228