[jdk21u-dev] RFR: 8319574: Exec/process tests should be marked as flagless

[Goetz Lindenmaier]

I backport this for parity with 21.0.4-oracle.

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Commit messages:
 - Backport 68110b7a82ae82e2485aec23aba5406d2a5c0327

Changes: https://git.openjdk.org/jdk21u-dev/pull/395/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=395&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319574
  Stats: 22 lines in 14 files changed: 13 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/395.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/395/head:pull/395

PR: https://git.openjdk.org/jdk21u-dev/pull/395