refactor(FormControl): update FormControl to use CSS Modules behind flag

[joshblack]

Closes https://github.com/github/primer/issues/3812

Changelog

New

Changed

• Update FormControl and shared internal components to use form control behind feature flag

Removed

Rollout strategy

• Minor release

[changeset-bot]

🦋 Changeset detected

Latest commit: bb0a9da

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@primer/react	Minor

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[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github depends on. If you are GitHub staff, we recommend testing these changes with github/github using the integration workflow. Thanks!

[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	103.69 KB (+0.35% 🔺)
packages/react/dist/browser.umd.js	104 KB (+0.32% 🔺)

[github-actions]

👋 Hi, there are new commits since the last successful integration test. We recommend running the integration workflow once more, unless you are sure the new changes do not affect github/github. Thanks!

[github-actions]

👋 Hi, there are new commits since the last successful integration test. We recommend running the integration workflow once more, unless you are sure the new changes do not affect github/github. Thanks!

[primer-integration]

👋 Hi from github/github! Your integration PR is ready: https://github.com/github/github/pull/355840

[hussam-i-am]

ab12bde adds the missing sx prop that was not being passed in for vertical layouts, which resolves the input not getting the full width styling that was being passed in on the "Create new issue" page.

[primer-integration]

🟢 golden-jobs completed with status success.

[langermank]

RL looks good 👍