[jdk21u-dev] RFR: 8316973: GC: Make TestDisableDefaultGC use 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 5f4be8cea980b3c2e8e5fb2067dc64b62fa0245c

Changes: https://git.openjdk.org/jdk21u-dev/pull/44/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=44&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316973
  Stats: 8 lines in 1 file changed: 0 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/44.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/44/head:pull/44

PR: https://git.openjdk.org/jdk21u-dev/pull/44