cherry-pick(#32714): fix(test runner): page.pause() should enable debug mode

[dgozman]

Fixes #32706.

[github-actions]

Test results for "tests 1"

3 failed
❌ [chromium-library] › library/client-certificates.spec.ts:206:3 › fetch › should fail with matching certificates in legacy pfx format
❌ [chromium-library] › library/client-certificates.spec.ts:527:3 › browser › should fail with matching certificates in legacy pfx format
❌ [playwright-test] › babel.spec.ts:135:5 › should not transform external

3 flaky

⚠️ [chromium-library] › library/trace-viewer.spec.ts:1108:1 › should open trace-1.37
⚠️ [webkit-library] › library/browsercontext-add-cookies.spec.ts:429:3 › should allow unnamed cookies
⚠️ [webkit-library] › library/download.spec.ts:698:3 › should convert navigation to a resource with unsupported mime type into download

29588 passed, 629 skipped
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Merge workflow run.