fix(trace): operate trace uri, not path

[pavelfeldman]

Fixes #38551

[pavelfeldman]

@cpAdm do you want to review this one? We used to pass absolute file path into traceURL and I replaced it with the uri that contains path + timestamp.

[cpAdm]

Can confirm that these changes fixes the related issue. But whilst add it, I think we should try to solve #38364 as well

[cpAdm]

Fetching this resource always fails

[pavelfeldman]

What do you mean? No live traces tests would pass if this failed.

[github-actions]

Test results for "tests 1"

2 failed
❌ [playwright-test] › web-server.spec.ts:25 › should create a server @windows-latest-node20-2
❌ [playwright-test] › web-server.spec.ts:555 › should create multiple servers @windows-latest-node20-2

1 flaky

⚠️ [firefox-library] › library/inspector/cli-codegen-1.spec.ts:1083 › cli codegen › should not throw csp directive violation errors `@firefox-ubuntu-22.04-node20`

34366 passed, 692 skipped

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Merge workflow run.

[github-actions]

Test results for "MCP"

5 failed
❌ [chromium] › mcp/screenshot.spec.ts:222 › browser_take_screenshot (filename: "output.png") @mcp-macos-15
❌ [chromium] › mcp/video.spec.ts:21 › should work with --save-video (isolated) @mcp-macos-15
❌ [chromium] › mcp/video.spec.ts:63 › should work with recordVideo (isolated) @mcp-macos-15
❌ [chromium] › mcp/video.spec.ts:21 › should work with --save-video (persistent) @mcp-macos-15
❌ [chromium] › mcp/video.spec.ts:63 › should work with recordVideo (persistent) @mcp-macos-15

2709 passed, 116 skipped

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Merge workflow run.