fix(ui): clear action selection when executing test

[agg23]

Fixes #34482. When executing a test with an existing selection in UI Mode, the action selection follows the test execution, up until completion or the first error, as it does on initial execution (without a selection).

This also fixes an issue where selections were preserved between tests, causing strange things to be highlighted.

[github-actions]

Test results for "tests 1"

6 failed
❌ [playwright-test] › tests/ui-mode-test-progress.spec.ts:115:5 › should preserve action list selection upon live trace update @macos-latest-node18-1
❌ [playwright-test] › tests/ui-mode-test-progress.spec.ts:115:5 › should preserve action list selection upon live trace update @ubuntu-latest-node18-1
❌ [playwright-test] › tests/ui-mode-test-progress.spec.ts:115:5 › should preserve action list selection upon live trace update @ubuntu-latest-node20-1
❌ [playwright-test] › tests/ui-mode-test-progress.spec.ts:115:5 › should preserve action list selection upon live trace update @ubuntu-latest-node22-1
❌ [webkit-library] › tests/library/inspector/title.spec.ts:35:5 › should update primary page URL when original primary closes @webkit-ubuntu-22.04-node18
❌ [playwright-test] › tests/ui-mode-test-progress.spec.ts:115:5 › should preserve action list selection upon live trace update @windows-latest-node18-1

15 flaky

⚠️ [chromium-page] › tests/page/page-event-request.spec.ts:151:3 › should report navigation requests and responses handled by service worker with routing @chromium-ubuntu-22.04-node20
⚠️ [firefox-page] › tests/page/page-evaluate.spec.ts:403:3 › should throw for too deep reference chain @firefox-ubuntu-22.04-node18
⚠️ [firefox-page] › tests/page/page-event-request.spec.ts:182:3 › should return response body when Cross-Origin-Opener-Policy is set @firefox-ubuntu-22.04-node18
⚠️ [installation tests] › tests/playwright-electron-should-work.spec.ts:21:5 › electron should work @package-installations-macos-latest
⚠️ [playwright-test] › tests/ui-mode-trace.spec.ts:341:5 › should work behind reverse proxy @ubuntu-latest-node20-1
⚠️ [webkit-library] › tests/library/inspector/cli-codegen-1.spec.ts:116:7 › cli codegen › should click after same-document navigation @webkit-ubuntu-22.04-node18
⚠️ [webkit-library] › tests/library/inspector/cli-codegen-csharp.spec.ts:227:7 › should work with --save-har and --save-har-glob in nunit @webkit-ubuntu-22.04-node18
⚠️ [webkit-library] › tests/library/proxy.spec.ts:93:11 › should proxy local network requests › by default › loopback address @webkit-ubuntu-22.04-node18
⚠️ [webkit-library] › tests/library/trace-viewer.spec.ts:149:1 › should open simple trace viewer @webkit-ubuntu-22.04-node18
⚠️ [webkit-library] › tests/library/trace-viewer.spec.ts:1551:1 › should not leak recorders @webkit-ubuntu-22.04-node18
⚠️ [webkit-library] › tests/library/video.spec.ts:475:5 › screencast › should scale frames down to the requested size @webkit-ubuntu-22.04-node18
⚠️ [webkit-page] › tests/page/page-leaks.spec.ts:82:5 › click should not leak @webkit-ubuntu-22.04-node18
⚠️ [webkit-page] › tests/page/page-leaks.spec.ts:107:5 › fill should not leak @webkit-ubuntu-22.04-node18
⚠️ [webkit-page] › tests/page/page-leaks.spec.ts:161:5 › waitFor should not leak @webkit-ubuntu-22.04-node18
⚠️ [webkit-page] › tests/page/page-screenshot.spec.ts:345:5 › page screenshot › should work while navigating @webkit-ubuntu-22.04-node18

37813 passed, 655 skipped
✔️✔️✔️

Merge workflow run.

[pavelfeldman]

I think this will break the live mode entirely.

[agg23]

Multiple team members have argued that it's intentional to preserve selection. Closing for now.