[jdk21u-dev] RFR: 8314840: 3 gc/epsilon tests ignore external vm options

[SendaoYan]

Hi all,

This pull request contains a backport of commit [da8abdc0](https://github.com/openjdk/jdk24u/commit/da8abdc0bf98e8afc9d56ffe25a8fe83ed1531a5) from the jdk24u [openjdk/jdk24u](https://git.openjdk.org/jdk24u) repository to jdk21u-dev repository.

The commit being backported was authored by SendaoYan on 1 Mar 2025.

Thanks!

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Commit messages:
 - Backport da8abdc0bf98e8afc9d56ffe25a8fe83ed1531a5

Changes: https://git.openjdk.org/jdk21u-dev/pull/1443/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1443&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314840
  Stats: 9 lines in 3 files changed: 0 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1443.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1443/head:pull/1443

PR: https://git.openjdk.org/jdk21u-dev/pull/1443