RFR: 8317316: G1: Make TestG1PercentageOptions use createTestJvm

[Leo Korinth]

Done basic testing, will do more testing before pushing (together with other tests)

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Commit messages:
 - _8317316: G1: Make TestG1PercentageOptions use createTestJvm

Changes: https://git.openjdk.org/jdk/pull/15987/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15987&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/jdk/pull/15987.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15987/head:pull/15987

PR: https://git.openjdk.org/jdk/pull/15987