chore: expose clear cache to test server

[pavelfeldman]

No description provided.

[github-actions]

Test results for "tests 1"

6 flaky

⚠️ [chromium-library] › library/tracing.spec.ts:243:5 › should not include trace resources from the previous chunks
⚠️ [chromium-library] › library/tracing.spec.ts:243:5 › should not include trace resources from the previous chunks
⚠️ [firefox-library] › library/tracing.spec.ts:243:5 › should not include trace resources from the previous chunks
⚠️ [playwright-test] › ui-mode-test-progress.spec.ts:165:5 › should update tracing network live
⚠️ [playwright-test] › ui-mode-trace.spec.ts:76:5 › should merge screenshot assertions
⚠️ [webkit-library] › library/tracing.spec.ts:243:5 › should not include trace resources from the previous chunks

26926 passed, 619 skipped
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Merge workflow run.