chore: fallback expect.extend to legacy

[pavelfeldman]

No description provided.

[github-actions]

Test results for "tests 1"

2 failed
❌ [playwright-test] › runner.spec.ts:118:5 › should ignore subprocess creation error because of SIGINT
❌ [webkit-codegen-mode-trace] › library/inspector/cli-codegen-2.spec.ts:409:7 › cli codegen › click should emit events in order

2 flaky

⚠️ [webkit-library] › library/video.spec.ts:165:5 › screencast › should work with old options
⚠️ [playwright-test] › ui-mode-test-watch.spec.ts:145:5 › should watch all

36334 passed, 747 skipped
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Merge workflow run.