[jdk21u-dev] RFR: 8311986: Disable runtime/os/TestTracePageSizes.java for ShenandoahGC

[Goetz Lindenmaier]

I backport this for parity with 21.0.3-oracle.

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Commit messages:
 - Backport 167d1c183546a9501a4f255baecc8a4a5b859ab1

Changes: https://git.openjdk.org/jdk21u-dev/pull/168/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=168&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8311986
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/168.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/168/head:pull/168

PR: https://git.openjdk.org/jdk21u-dev/pull/168