[jdk21u-dev] RFR: 8321718: ProcessTools.executeProcess calls waitFor before logging

[Goetz Lindenmaier]

I backport this to streamline tests in 21.

I ran some tests using these files.

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Commit messages:
 - Backport 9ab29f8dcd1c0092e4251f996bd53c704e87a74a

Changes: https://git.openjdk.org/jdk21u-dev/pull/475/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=475&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321718
  Stats: 61 lines in 3 files changed: 47 ins; 11 del; 3 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/475.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/475/head:pull/475

PR: https://git.openjdk.org/jdk21u-dev/pull/475