Clean up the feature flag for primer_react_segmented_control_tooltip

[khiga8]

Closes: https://github.com/github/primer/issues/4723

Changelog

Removed

Removes feature flag for primer_react_segmented_control_tooltip and formally GAs having a tooltip by default on SegmentedControl.IconButton

Rollout strategy

• Patch release
• Minor release
• Major release; if selected, include a written rollout or migration plan
• None; if selected, include a brief description as to why

Testing & Reviewing

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github (Learn more about how to run integration tests)

[changeset-bot]

🦋 Changeset detected

Latest commit: df63579

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	91.92 KB (+0.02% 🔺)
packages/react/dist/browser.umd.js	92.08 KB (-0.17% 🔽)

[Copilot]

Pull Request Overview

This PR removes the feature flag for primer_react_segmented_control_tooltip and formally graduates the tooltip functionality for SegmentedControl.IconButton to general availability. The change makes tooltips the default behavior without requiring a feature flag.

• Remove the feature flag primer_react_segmented_control_tooltip from the codebase
• Simplify the SegmentedControlIconButton component by removing conditional rendering logic
• Update tests to reflect the new default behavior

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
packages/react/src/SegmentedControl/SegmentedControlIconButton.tsx	Remove feature flag check and conditional rendering, keeping only the tooltip-enabled code path
packages/react/src/SegmentedControl/SegmentedControl.test.tsx	Update test descriptions and remove feature flag wrapper from tests
packages/react/src/FeatureFlags/DefaultFeatureFlags.ts	Remove the primer_react_segmented_control_tooltip feature flag definition
.changeset/strong-mangos-rest.md	Add changelog entry documenting the removal of the feature flag