RFR: 8299023: TestPLABResize.java and TestPLABPromotion.java are failing intermittently

[Leonid Mesnik]

These 2 tests are too sensitive for memory usage. They are failing intermittently with JFR, C1-only and some other modes that break their expectations.
It would be better just to disable their execution with any additional parameters.

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Commit messages:
 - 8299023

Changes: https://git.openjdk.org/jdk/pull/17887/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17887&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299023
  Stats: 4 lines in 2 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/17887.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17887/head:pull/17887

PR: https://git.openjdk.org/jdk/pull/17887