[jdk21u] RFR: 8315415: OutputAnalyzer.shouldMatchByLine() fails in some cases

[Goetz Lindenmaier]

I backport this for parity with 17.0.11-oracle.  21 should not fall back.

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Commit messages:
 - Backport 7b1e2bfe0f805a69b59839b6bf8250b62ea356b8

Changes: https://git.openjdk.org/jdk21u/pull/305/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=305&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315415
  Stats: 28 lines in 1 file changed: 0 ins; 0 del; 28 mod
  Patch: https://git.openjdk.org/jdk21u/pull/305.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/305/head:pull/305

PR: https://git.openjdk.org/jdk21u/pull/305