[jdk21u-dev] RFR: 8325042: Remove unused JVMDITools test files

[Goetz Lindenmaier]

I backport this for parity with 21.0.7-oracle

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Commit messages:
 - Backport 0cc8e5beed664a21c2668be86a9d3c5a1b165743

Changes: https://git.openjdk.org/jdk21u-dev/pull/1368/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1368&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8325042
  Stats: 200 lines in 3 files changed: 0 ins; 200 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1368.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1368/head:pull/1368

PR: https://git.openjdk.org/jdk21u-dev/pull/1368