test(upgrade): enable SCSS #{!important} @apply migration test

[pavan-sh]

Summary

This PR enables coverage for Sass/SCSS @apply usage with interpolation (#{!important}) in the @tailwindcss/upgrade codemod.

The codemod already handles #{!important} in migrate-at-apply.ts, but the corresponding test was previously skipped with a TODO. This change removes the skip and updates the comment so CI will catch regressions and the supported behavior stays documented.

Test plan

• Updated the existing unit test in packages/@tailwindcss-upgrade/src/codemods/css/migrate-at-apply.test.ts by un-skipping the #{!important} case and verifying the expected output snapshot.
• Local verification (limited in this environment): ensured lint/pre-commit formatting passes and that the change is isolated to tests only.

Recommended CI/local verification in a full dev environment (with Rust toolchain available):

pnpm install
pnpm test

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between bf2e2fe and dcd48d7.

📒 Files selected for processing (1)

• packages/@tailwindcss-upgrade/src/codemods/css/migrate-at-apply.test.ts

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Walkthrough

A skipped test in the migrate-at-apply test suite was enabled. The test validates Sass interpolation for the !important declaration using the #{!important} syntax. The test logic remains consistent with existing !important handling in the migration flow. No changes were made to the core migration behavior or error handling logic. The test file was modified with minimal changes totaling +2/-2 lines.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: enabling a skipped SCSS #{!important} @apply migration test.
Description check	✅ Passed	The description is directly related to the changeset, explaining why the test was previously skipped, what the change does, and how to verify it.

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[Moses-main]

Hi team,

I'll enable the SCSS #(!important} @apply migration test. Let me work on this!

[RobinMalfait]

Hey! We skipped this test on purpose, we're currently not looking to add SCSS support. Thanks!

[pavan-sh]

Hey! We skipped this test on purpose, we're currently not looking to add SCSS support. Thanks!

No problem. Thanks for review and valuable time.