[jdk21u-dev] RFR: 8314320: Mark runtime/CommandLine/ tests as flagless

[Goetz Lindenmaier]

I backport this to keep the 21u test suite up-to-date. This will simplify future test backports.

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Commit messages:
 - Backport f481477144d25bf2b5ee44f202705588bd99d4f4

Changes: https://git.openjdk.org/jdk21u-dev/pull/84/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=84&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314320
  Stats: 56 lines in 23 files changed: 31 ins; 1 del; 24 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/84.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/84/head:pull/84

PR: https://git.openjdk.org/jdk21u-dev/pull/84