[jdk22u] RFR: 8323515: Create test alias "all" for all test roots

[Aleksey Shipilev]

Improves JDK 22u testability by allowing to run all tests at once. Test groups sanity is going to be tested with GHA.

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Commit messages:
 - Backport 2d5cb97288f7bf5acaa24632118d6a7a6a53c93e
 - Backport 8b9bf758801400e4491326cd4c90fc117b9d97e1

Changes: https://git.openjdk.org/jdk22u/pull/65/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk22u&pr=65&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8323515
  Stats: 50 lines in 5 files changed: 42 ins; 5 del; 3 mod
  Patch: https://git.openjdk.org/jdk22u/pull/65.diff
  Fetch: git fetch https://git.openjdk.org/jdk22u.git pull/65/head:pull/65

PR: https://git.openjdk.org/jdk22u/pull/65