[jdk17u-dev] RFR: 8289400: Improve com/sun/jdi/TestScaffold error reporting

[Goetz Lindenmaier]

I backport this for parity with 17.0.7-oracle.

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Commit messages:
 - Backport da99e3e8299f3a476603aa43a99164c2c01adff4

Changes: https://git.openjdk.org/jdk17u-dev/pull/1138/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1138&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8289400
  Stats: 4 lines in 1 file changed: 4 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1138.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/1138/head:pull/1138

PR: https://git.openjdk.org/jdk17u-dev/pull/1138