[jdk21u-dev] RFR: 8314333: Update com/sun/jdi/ProcessAttachTest.java to use ProcessTools.createTestJvm(..)

[Goetz Lindenmaier]

I backport this to keep the 21u test suite up-to-date. This will simplify future test backports.

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Commit messages:
 - Backport 7342f5a0337df88b6787c4c2b53c8007667b6636

Changes: https://git.openjdk.org/jdk21u-dev/pull/64/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=64&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314333
  Stats: 5 lines in 1 file changed: 0 ins; 3 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/64.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/64/head:pull/64

PR: https://git.openjdk.org/jdk21u-dev/pull/64