RFR: 8304353: Add lib-test tier1 testing in GHA

[Zdenek Zambersky]

Tier1 testing in GitHub should include lib-test.

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Commit messages:
 - Added lib-test tier1 testing in GH

Changes: https://git.openjdk.org/jdk/pull/13063/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13063&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8304353
  Stats: 4 lines in 1 file changed: 4 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13063.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/13063/head:pull/13063

PR: https://git.openjdk.org/jdk/pull/13063