chore: update chrome extensions doc and tests

[dgozman]

Run tests on new headless and update docs from headed to new headless. The persistent context requirement is still there.

[github-actions]

Test results for "tests 1"

3 failed
❌ [installation tests] › tests/playwright-electron-should-work.spec.ts:21:5 › electron should work @package-installations-ubuntu-latest
❌ [installation tests] › tests/playwright-electron-should-work.spec.ts:31:5 › electron should work with special characters in path @package-installations-ubuntu-latest
❌ [installation tests] › tests/playwright-electron-should-work.spec.ts:44:5 › should work when wrapped inside @playwright/test and trace is enabled @package-installations-ubuntu-latest

4 flaky

⚠️ [firefox-page] › tests/page/page-evaluate.spec.ts:403:3 › should throw for too deep reference chain @firefox-ubuntu-22.04-node18
⚠️ [chromium-library] › tests/library/inspector/cli-codegen-javascript.spec.ts:111:5 › should print load/save storageState @ubuntu-20.04-chromium-tip-of-tree
⚠️ [webkit-library] › tests/library/inspector/cli-codegen-aria.spec.ts:77:7 › should update aria snapshot highlight @webkit-ubuntu-22.04-node18
⚠️ [webkit-page] › tests/page/page-set-input-files.spec.ts:205:3 › should upload multiple large files @webkit-ubuntu-22.04-node18

37515 passed, 654 skipped
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Merge workflow run.