CI: tag flaky test

[potatowagon]

tag flaky tests that failed on PRs (due to flakiness) as flaky

only adding

  {
      tag: '@flaky',
  }

#6289

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Name	Status	Preview	Comments	Updated (UTC)
lexical	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 11, 2024 7:45am
lexical-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 11, 2024 7:45am

[github-actions]

size-limit report 📦

Path	Size
lexical - cjs	29.77 KB (0%)
lexical - esm	29.6 KB (0%)
@lexical/rich-text - cjs	38.24 KB (0%)
@lexical/rich-text - esm	31.46 KB (0%)
@lexical/plain-text - cjs	36.82 KB (0%)
@lexical/plain-text - esm	28.86 KB (0%)
@lexical/react - cjs	40.01 KB (0%)
@lexical/react - esm	32.93 KB (0%)