Revert "test: roll stable-test-runner to 1.63.0-alpha-2026-08-03"

[Yury Semikhatsky (yury-s)]

Reverts #42091

npm error code E404
npm error 404 Not Found - GET https://packagefeedproxy.microsoft.io/npm/playwright-core/-/playwright-core-1.63.0-alpha-2026-08-03.tgz - Cannot find the file playwright-core-1.63.0-alpha-2026-08-03.tgz in package 'playwright-core 1.63.0-alpha-2026-08-03' in feed 'npm-public'
npm error 404

[Yury Semikhatsky (yury-s)]

/cc Simon Knott (@Skn0tt)

[github-actions]

Test results for "MCP"

8050 passed, 1284 skipped

---

Merge workflow run.

[github-actions]

Test results for "tests 1"

8 flaky

⚠️ [chromium-library] › library/video.spec.ts:736 › screencast › should work with video+trace `@frozen-time-library-chromium-linux`
⚠️ [chromium-library] › library/video.spec.ts:495 › screencast › should capture static page in persistent context Radoslav Kirilov (@smoke) `@chromium-ubuntu-22.04-arm-node20`
⚠️ [chromium-library] › library/beforeunload.spec.ts:130 › should support dismissing the dialog multiple times `@realtime-time-library-chromium-linux`
⚠️ [chromium-library] › library/video.spec.ts:736 › screencast › should work with video+trace `@realtime-time-library-chromium-linux`
⚠️ [chromium-library] › library/chromium/chromium.spec.ts:371 › should produce network events, routing, and annotations for Service Worker `@chromium-ubuntu-22.04-node24`
⚠️ [chromium-library] › library/popup.spec.ts:260 › should not throw when click closes popup `@chromium-ubuntu-22.04-node22`
⚠️ [firefox-page] › page/page-event-request.spec.ts:181 › should return response body when Cross-Origin-Opener-Policy is set `@firefox-ubuntu-22.04-node20`
⚠️ [playwright-test] › ui-mode-test-watch.spec.ts:185 › should watch new file `@windows-latest-node22`

51191 passed, 1188 skipped

---

Merge workflow run.