chore: remove all references to css_moduels_ga FF in codebase

[francinelucca]

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Latest commit: acbe950

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[Copilot]

Pull Request Overview

This PR removes all references to the css_modules_ga feature flag from the codebase, indicating that CSS modules functionality has been fully rolled out and the feature flag is no longer needed.

• Removed the primer_react_css_modules_ga feature flag from the default configuration
• Cleaned up the Storybook configuration to remove environment variable handling for the removed flag

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/react/src/FeatureFlags/DefaultFeatureFlags.ts	Removed the primer_react_css_modules_ga feature flag entry
packages/react/.storybook/preview.jsx	Removed PRIMER_REACT_CSS_MODULES_GA from the feature flag environment list

Comments suppressed due to low confidence (1)

packages/react/.storybook/preview.jsx:237

• With an empty Set, the for loop on lines 236-237 will never execute. Consider removing this unused loop logic or adding a comment explaining why this structure is maintained for future feature flags.

const featureFlagEnvList = new Set([])

for (const flag of featureFlagEnvList) {
  if (import.meta.env[`VITE_${flag}`] === '1') {

[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	89.58 KB (+0.09% 🔺)
packages/react/dist/browser.umd.js	89.57 KB (-0.1% 🔽)