fix(ci): support fork PR preview builds and smoke tests

[rubencarvalho]

Summary

• Skip Azure Blob Storage deploy on fork PRs (and when simulating with the test_fork_preview label) because repository secrets are unavailable to external contributions
• Keep documentation/Storybook builds green and run Playwright smoke tests against locally served build artifacts for fork PRs
• Gracefully skip Chromatic on fork PRs that have the run_vrt label instead of failing on an empty CHROMATIC_TOKEN

Test plan

• Add test_fork_preview label to this PR and confirm preview workflow skips Azure deploy, posts fork-style comment, and smoke tests pass
• Remove test_fork_preview label and confirm normal Azure preview links are deployed
• Verify a real fork PR (e.g. fix(menu): Use package import for sp-menu-divider registration #6420) passes build + smoke tests after merge

Made with Cursor

[changeset-bot]

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Latest commit: 85d38c6

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[github-actions]

📚 Branch Preview Links

✅ Documentation and Storybook builds completed successfully.

Preview deployment is not available for pull requests from forked repositories. GitHub does not expose repository secrets to workflows triggered by external contributions, so Azure Blob Storage uploads are skipped. Smoke tests still run against the built documentation served locally in CI.

This PR is using the test_fork_preview label to simulate fork PR behavior on an internal branch.

[coveralls]

Coverage Report for CI Build 27823134133

Warning

No base build found for commit 8551787 on main.
Coverage changes can't be calculated without a base build.
If a base build is processing, this comment will update automatically when it completes.

Coverage: 96.24%

Details

• Patch coverage: No coverable lines changed in this PR.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

Requires a base build to compare against. How to fix this →

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Coverage Stats

Relevant Lines:	39108
Covered Lines:	37837
Line Coverage:	96.75%
Relevant Branches:	6450
Covered Branches:	6008
Branch Coverage:	93.15%
Branches in Coverage %:	Yes
Coverage Strength:	458.45 hits per line

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💛 - Coveralls