feat(html): show top-level errors

[dgozman]

Drive-by:

• extract TestErrorView;
• replace data-test-id with data-testid and getByTestId().

---

[github-actions]

Test results for "tests 1"

1 failed
❌ [installation tests] › playwright-cdn.spec.ts:40:7 › playwright cdn failover should work (https://playwright-akamai.azureedge.net)

6 flaky

⚠️ [chromium] › library/tracing.spec.ts:239:5 › should not include trace resources from the previous chunks
⚠️ [firefox] › library/tracing.spec.ts:239:5 › should not include trace resources from the previous chunks
⚠️ [chromium] › library/tracing.spec.ts:239:5 › should not include trace resources from the previous chunks
⚠️ [playwright-test] › ui-mode-test-ct.spec.ts:55:5 › should run component tests after editing test
⚠️ [webkit] › library/browsercontext-reuse.spec.ts:50:1 › should reset serviceworker
⚠️ [webkit] › page/page-wait-for-navigation.spec.ts:85:3 › should work with clicking on links which do not commit navigation

25961 passed, 603 skipped
✔️✔️✔️

Merge workflow run.