chore(itest): guard playwright tarball size and bundled deps

[pavelfeldman]

Summary

• Upper-bound test on playwright-core.tgz and playwright.tgz sizes to catch accidental bloat.
• Lower-bound test on the Total Packages count inside each lib/**/*.LICENSE to catch broken bundle generation or silently-removed vendored deps.

[pavelfeldman]

@microsoft-github-policy-service rerun

[github-actions]

Test results for "MCP"

5974 passed, 916 skipped

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Merge workflow run.

[github-actions]

Test results for "tests 1"

8 flaky

⚠️ [chromium-library] › library/popup.spec.ts:261 › should not throw when click closes popup `@chromium-ubuntu-22.04-arm-node20`
⚠️ [chromium-library] › library/video.spec.ts:275 › screencast › should capture navigation `@chromium-ubuntu-22.04-arm-node20`
⚠️ [chromium-library] › library/video.spec.ts:719 › screencast › should work with video+trace `@chromium-ubuntu-22.04-node24`
⚠️ [chromium-library] › library/popup.spec.ts:261 › should not throw when click closes popup `@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`
⚠️ [webkit-page] › page/page-autowaiting-basic.spec.ts:79 › should await form-post on click `@webkit-ubuntu-22.04-node20`
⚠️ [playwright-test] › ui-mode-test-output.spec.ts:118 › should collapse repeated console messages for test `@ubuntu-latest-node20`
⚠️ [playwright-test] › ui-mode-trace.spec.ts:763 › should partition action tree state by test `@windows-latest-node20`

39147 passed, 847 skipped

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Merge workflow run.