[jdk21u-dev] RFR: 8317316: G1: Make TestG1PercentageOptions 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 d8cd60588aef6abcbfedbe3262d9a094c9bbcb8c

Changes: https://git.openjdk.org/jdk21u-dev/pull/49/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=49&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8317316
  Stats: 6 lines in 1 file changed: 0 ins; 2 del; 4 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/49.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/49/head:pull/49

PR: https://git.openjdk.org/jdk21u-dev/pull/49