[jdk25u-dev] RFR: 8372348: Adjust some UL / JFR string deduplication output messages

[Matthias Baesken]

Backport of 8372348, JFR string dedup event is missing in 25

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Commit messages:
 - Backport 3f20eb943532c5c76e55b14292139749bd704ce4

Changes: https://git.openjdk.org/jdk25u-dev/pull/127/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u-dev&pr=127&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8372348
  Stats: 13 lines in 1 file changed: 4 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/jdk25u-dev/pull/127.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u-dev.git pull/127/head:pull/127

PR: https://git.openjdk.org/jdk25u-dev/pull/127