[jdk21u-dev] RFR: 8320712: Rewrite BadFactoryTest in pure Java

[Goetz Lindenmaier]

I backport this for parity with 21.0.4-oracle.

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Commit messages:
 - Backport 66971600f7ba796ff5bb9714591c3faa0bb2249d

Changes: https://git.openjdk.org/jdk21u-dev/pull/326/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=326&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8320712
  Stats: 86 lines in 2 files changed: 24 ins; 60 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/326.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/326/head:pull/326

PR: https://git.openjdk.org/jdk21u-dev/pull/326