…ons triggered in legacy test (mondrake)

This PR was submitted for the 6.1 branch but it was merged into the 5.4 branch instead.

Discussion
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[PhpUnitBridge] Exclude from baseline generation deprecations triggered in legacy test

| Q             | A
| ------------- | ---
| Branch?       | 6.1<!-- see below -->
| Bug fix?      | yes
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tickets       | Fix #46710  <!-- prefix each issue number with "Fix #", no need to create an issue if none exist, explain below instead -->
| License       | MIT
<!-- | Doc PR        | symfony/symfony-docs#... required for new features -->
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Additionally (see https://symfony.com/releases):
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 - Bug fixes must be submitted against the lowest maintained branch where they apply
   (lowest branches are regularly merged to upper ones so they get the fixes too.)
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Commits
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4f96afe Exclude from baseline generation deprecations triggered in legacy test