[jdk21u-dev] RFR: 8372441: JFR: Improve logging of TestBackToBackSensitive

[Goetz Lindenmaier]

I backport this for parity with 21.0.11-oracle.

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Depends on: https://git.openjdk.org/jdk21u-dev/pull/2566

Commit messages:
 - backport b98114f4a20bcf3390114b56d05c38b23268979a
 - c0abecdd1ffe59314bc17aeec0684cdda33a222d

Changes: https://git.openjdk.org/jdk21u-dev/pull/2567/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2567&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8372441
  Stats: 45 lines in 4 files changed: 25 ins; 11 del; 9 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2567.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2567/head:pull/2567

PR: https://git.openjdk.org/jdk21u-dev/pull/2567