[jdk24u] RFR: 8357173: Split jtreg test group jdk tier3

[Erik Joelsson]

Clean backport of this change. 

We need to be able to run the jdk_jpackage tests separately from the rest of jdk tier3 due to different requirements on the test environment. To achieve this we would like to introduce tier3_part1 and tier3_jpackage groups as sub groups to tier3.

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Commit messages:
 - Backport afcbf6b2f49c00a544e6db5b4ed9da76c0bdcba4

Changes: https://git.openjdk.org/jdk24u/pull/226/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk24u&pr=226&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8357173
  Stats: 13 lines in 1 file changed: 11 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk24u/pull/226.diff
  Fetch: git fetch https://git.openjdk.org/jdk24u.git pull/226/head:pull/226

PR: https://git.openjdk.org/jdk24u/pull/226