feat(test-runner): add {testFileBaseName} token to snapshotPathTemplate

[devareddy05]

Summary

• Adds a new {testFileBaseName} token to snapshotPathTemplate, expanding to the test file name without its last extension (matches path.parse().name).
• Sample: for a test file page/page-click.spec.ts, {testFileBaseName} resolves to page-click.spec. The existing {testFileName} keeps producing page-click.spec.ts.
• Useful on Windows where a test file 01-render.test.ts and a sibling snapshot folder of the same name collide; users can now write {testFileDir}/{testFileBaseName}-snapshots/{arg}{ext} to drop the trailing extension.
• Extended the existing tokens should expand property test in snapshot-path-template.spec.ts rather than adding a new test.

Fixes #24171

[github-actions]

Test results for "tests 1"

1 failed
❌ [playwright-test] › ui-mode-test-network-tab.spec.ts:395 › should copy network request @windows-latest-node20

15 flaky

⚠️ [installation tests] › connect-to-selenium.spec.ts:20 › connect to selenium `@package-installations-ubuntu-latest`
⚠️ [chromium-library] › library/chromium/connect-over-cdp.spec.ts:449 › should be able to connect via localhost `@ubuntu-22.04-chromium-tip-of-tree`
⚠️ [chromium-library] › library/video.spec.ts:682 › screencast › should capture full viewport on hidpi `@ubuntu-22.04-chromium-tip-of-tree`
⚠️ [chromium-library] › library/video.spec.ts:719 › screencast › should work with video+trace `@ubuntu-22.04-chromium-tip-of-tree`
⚠️ [chromium-library] › library/chromium/connect-over-cdp.spec.ts:449 › should be able to connect via localhost `@chromium-ubuntu-22.04-arm-node20`
⚠️ [chromium-library] › library/popup.spec.ts:261 › should not throw when click closes popup `@chromium-ubuntu-22.04-arm-node20`
⚠️ [chromium-library] › library/chromium/connect-over-cdp.spec.ts:449 › should be able to connect via localhost `@chromium-ubuntu-22.04-node24`
⚠️ [chromium-page] › page/page-request-continue.spec.ts:754 › propagate headers cross origin redirect after interception `@chromium-ubuntu-22.04-node24`
⚠️ [chromium-library] › library/chromium/connect-over-cdp.spec.ts:449 › should be able to connect via localhost `@chromium-ubuntu-22.04-node20`
⚠️ [chromium-library] › library/chromium/connect-over-cdp.spec.ts:449 › should be able to connect via localhost `@chromium-ubuntu-22.04-node22`
⚠️ [chromium-library] › library/video.spec.ts:719 › screencast › should work with video+trace `@chromium-ubuntu-22.04-node22`
⚠️ [firefox-library] › library/inspector/cli-codegen-1.spec.ts:1080 › cli codegen › should not throw csp directive violation errors `@firefox-ubuntu-22.04-node20`
⚠️ [firefox-library] › library/inspector/cli-codegen-3.spec.ts:224 › cli codegen › should generate frame locators (4) `@firefox-ubuntu-22.04-node20`
⚠️ [firefox-page] › page/page-emulate-media.spec.ts:144 › should keep reduced motion and color emulation after reload `@firefox-ubuntu-22.04-node20`
⚠️ [playwright-test] › ui-mode-trace.spec.ts:433 › should work behind reverse proxy `@windows-latest-node20`

41463 passed, 847 skipped

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Merge workflow run.

[github-actions]

Test results for "MCP"

5 failed
❌ [chromium] › mcp/dashboard.spec.ts:347 › save recording streams WebM bytes to the chosen file @mcp-windows-latest
❌ [firefox] › mcp/cli-devtools.spec.ts:204 › video-start-stop @mcp-windows-latest
❌ [firefox] › mcp/cli-devtools.spec.ts:218 › video-chapter @mcp-windows-latest
❌ [chrome] › mcp/mouse.spec.ts:69 › browser_mouse_click_xy (default) @mcp-macos-latest
❌ [webkit] › mcp/dashboard.spec.ts:185 › should start dashboard and annotate when no dashboard is running @mcp-macos-latest

6803 passed, 927 skipped

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Merge workflow run.

[devareddy05]

Test results for "MCP"

5 failed ❌ [chromium] › mcp/dashboard.spec.ts:347 › save recording streams WebM bytes to the chosen file @mcp-windows-latest ❌ [firefox] › mcp/cli-devtools.spec.ts:204 › video-start-stop @mcp-windows-latest ❌ [firefox] › mcp/cli-devtools.spec.ts:218 › video-chapter @mcp-windows-latest ❌ [chrome] › mcp/mouse.spec.ts:69 › browser_mouse_click_xy (default) @mcp-macos-latest ❌ [webkit] › mcp/dashboard.spec.ts:185 › should start dashboard and annotate when no dashboard is running @mcp-macos-latest

6803 passed, 927 skipped

Merge workflow run.

Hi maintainers @Skn0tt and @dgozman

I believe the Chromium failure might be flaky, it’s been passing consistently in my local setup without issues.

Happy to add a changeset, rebase, or make any adjustments as needed. Thanks for taking a look!