test: some tests for expected API behavior

[yury-s]

Adding some tests discussed in #32434

[github-actions]

Test results for "tests 1"

1 failed
❌ [playwright-test] › babel.spec.ts:135:5 › should not transform external

5 flaky

⚠️ [chromium-library] › library/trace-viewer.spec.ts:1469:1 › should allow showing screenshots instead of snapshots
⚠️ [chromium-library] › library/capabilities.spec.ts:141:3 › should not crash on showDirectoryPicker
⚠️ [chromium-library] › library/client-certificates.spec.ts:551:3 › browser › should pass with matching certificates on context APIRequestContext instance
⚠️ [chromium-library] › library/trace-viewer.spec.ts:1469:1 › should allow showing screenshots instead of snapshots
⚠️ [webkit-page] › page/page-goto.spec.ts:312:3 › should fail when navigating to bad SSL after redirects

29585 passed, 634 skipped
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Merge workflow run.