[jdk24u] RFR: 8352879: TestPeriod.java and TestGetContentType.java run wrong test class [v2]

[SendaoYan]

> Hi all,
> 
> This pull request contains a backport of commit [b7ca76ef](https://github.com/openjdk/jdk/commit/b7ca76ef4bfc640668492e655acc6d755411a92f) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> The commit being backported was authored by SendaoYan on 1 Apr 2025 and was reviewed by Erik Gahlin.
> 
> Thanks!

SendaoYan has updated the pull request incrementally with one additional commit since the last revision:

  Backport b7ca76ef4bfc640668492e655acc6d755411a92f

-------------

Changes:
  - all: https://git.openjdk.org/jdk24u/pull/169/files
  - new: https://git.openjdk.org/jdk24u/pull/169/files/29669fdf..cebd6855

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk24u&pr=169&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk24u&pr=169&range=00-01

  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk24u/pull/169.diff
  Fetch: git fetch https://git.openjdk.org/jdk24u.git pull/169/head:pull/169

PR: https://git.openjdk.org/jdk24u/pull/169