revert: Remove support for sx from FormControl component (#6681)

[francinelucca]

This is not going to play well with our useSlots strategy, reverting and will fix up for next release

[changeset-bot]

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Latest commit: eea3868

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[Copilot]

Pull Request Overview

This PR reverts the removal of sx prop support from the FormControl component and its subcomponents. The revert is necessary because the previous change would conflict with the existing useSlots strategy implementation.

Key Changes

• Restores sx prop support to FormControl and all its subcomponents (Caption, Label, LeadingVisual, Validation)
• Reverts from CSS modules back to styled-components for FormControlLeadingVisual
• Re-adds FormControl to styled-react package exports

Reviewed Changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/styled-react/src/index.tsx	Re-exports FormControl from @primer/react and removes local FormControl implementation
packages/styled-react/src/components/FormControl.tsx	Removes the entire styled-react FormControl wrapper component
packages/react/src/index.ts	Removes FormControl type exports that were added in the reverted change
packages/react/src/experimental/SelectPanel2/SelectPanel.examples.stories.tsx	Replaces CSS class usage with sx prop for FormControl styling
packages/react/src/experimental/SelectPanel2/SelectPanel.examples.stories.module.css	Removes FormControl CSS class definition
packages/react/src/tests/snapshots/exports.test.ts.snap	Updates test snapshot to reflect removed type exports
packages/react/src/FormControl/index.ts	Removes FormControl type exports
packages/react/src/FormControl/FormControlLeadingVisual.tsx	Reverts from CSS modules to styled-components and adds sx prop support
packages/react/src/FormControl/FormControlLeadingVisual.module.css	Removes CSS module file
packages/react/src/FormControl/FormControlLabel.tsx	Adds sx prop support back to FormControlLabel
packages/react/src/FormControl/FormControlCaption.tsx	Adds sx prop support and BoxWithFallback wrapper
packages/react/src/FormControl/FormControl.tsx	Adds sx prop support and BoxWithFallback wrappers
packages/react/src/FormControl/FormControl.docs.json	Adds sx prop documentation for all FormControl components
.changeset/grumpy-lobsters-obey.md	Removes the changeset for the reverted FormControl changes

[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!