RFR: 8324937: GHA: Avoid multiple test suites per job

[Aleksey Shipilev]

See the description in the bug. This mitigates the issue by splitting out the only test job that has two test suites in it.

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Commit messages:
 - Revert test breakage and touchups
 - Break the tier1_compiler test and see what happens
 - Fix

Changes: https://git.openjdk.org/jdk/pull/17627/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17627&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8324937
  Stats: 6 lines in 1 file changed: 5 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/17627.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17627/head:pull/17627

PR: https://git.openjdk.org/jdk/pull/17627