[jdk25u-dev] RFR: 8372441: JFR: Improve logging of TestBackToBackSensitive

[Goetz Lindenmaier]

I backport this for parity with 25.0.3-oracle.

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Depends on: https://git.openjdk.org/jdk25u-dev/pull/169

Commit messages:
 - backport c0abecdd1ffe59314bc17aeec0684cdda33a222d

Changes: https://git.openjdk.org/jdk25u-dev/pull/170/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u-dev&pr=170&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8372441
  Stats: 18 lines in 1 file changed: 9 ins; 6 del; 3 mod
  Patch: https://git.openjdk.org/jdk25u-dev/pull/170.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u-dev.git pull/170/head:pull/170

PR: https://git.openjdk.org/jdk25u-dev/pull/170