RFR: 8372348: Adjust some UL / JFR string deduplication output messages [v3]

[Francesco Andreuzzi]

On Wed, 17 Dec 2025 14:37:57 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

>> There is some UL output in the string deduplication code that is not very clear and has room for improvement.
>> The inspected strings number should be shown and the new unknown strings get a changed text.
>> (also the new JFR strip dedup event  description is slightly adjusted)
>
> Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Adjust output

Marked as reviewed by fandreuzzi (Committer).

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PR Review: https://git.openjdk.org/jdk/pull/28455#pullrequestreview-3588334817