[jdk25] RFR: 8361827: [TESTBUG] serviceability/HeapDump/UnmountedVThreadNativeMethodAtTop.java throws OutOfMemoryError

[SendaoYan]

Hi all,

This pull request contains a backport of commit [cbb3d23e](https://github.com/openjdk/jdk/commit/cbb3d23e19a8a893bf2fbda03e7bda4f4b7a59a6) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository to jdk25.


Test-fix only to improves test performance and stability. Change has been verified locally, no risk.

Thanks!

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Commit messages:
 - Backport cbb3d23e19a8a893bf2fbda03e7bda4f4b7a59a6

Changes: https://git.openjdk.org/jdk/pull/26343/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26343&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8361827
  Stats: 10 lines in 1 file changed: 10 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/26343.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26343/head:pull/26343

PR: https://git.openjdk.org/jdk/pull/26343