FilteredActionList: Remove usingRemoveActiveDescendant logic

[TylerJDev]

Part of https://github.com/github/primer/issues/5900

• Removes usingRemoveActiveDescendant in FilteredActionList.
  • We will remove primer_react_select_panel_remove_active_descendant once this is merged.
• Adds private prop to FilteredActionList that allows configuration of focus management.

Changelog

New

• Adds internal (private) prop to FilteredActionList

Removed

• usingRemoveActiveDescendant logic removed from FilteredActionList

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: b44a0bc

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

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github-ui depends on. If you are GitHub staff, test these changes with github/github-ui using the integration workflow. Or, apply the integration-tests: skipped manually label to skip these checks.

[primer-integration]

👋 Hi from github/github-ui! Your integration PR is ready: https://github.com/github/github-ui/pull/6873

[primer-integration]

🟢 ci completed with status success.

[Copilot]

Pull Request Overview

This PR removes the primer_react_select_panel_remove_active_descendant feature flag from FilteredActionList and replaces it with a private prop _PrivateFocusManagement that allows internal configuration of focus management strategies (roving tabindex vs. active-descendant).

Key changes:

• Feature flag logic replaced with a private prop-based approach
• Test infrastructure updated to use prop-based configuration instead of feature flags
• Simplified variable naming from usingRemoveActiveDescendant to usingRovingTabindex

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
packages/react/src/SelectPanel/SelectPanel.test.tsx	Updated test infrastructure to use renderWithProp helper instead of feature flag wrapper
packages/react/src/FilteredActionList/useAnnouncements.tsx	Replaced feature flag with focus management parameter
packages/react/src/FilteredActionList/FilteredActionList.tsx	Added _PrivateFocusManagement private prop and removed feature flag dependency
.changeset/rotten-goats-stare.md	Added changelog entry for minor release

[Copilot]

Missing usingRemoveActiveDescendant parameter in renderWithProp call. All other test calls in the loop pass this parameter, so this call should pass it as well to ensure consistent testing of both focus management modes.

Suggested change

	renderWithProp(<BasicSelectPanel />)
	renderWithProp(<BasicSelectPanel />, usingRemoveActiveDescendant)

[Copilot]

Missing usingRemoveActiveDescendant parameter in renderWithProp call. This test case is inside the loop that iterates over both true and false values but doesn't pass the parameter to test both modes.

Suggested change

	<BasicSelectPanel />
	<BasicSelectPanel usingRemoveActiveDescendant={usingRemoveActiveDescendant} />

[Copilot]

Missing usingRemoveActiveDescendant parameter in renderWithProp call. This test is inside the loop that tests both focus management modes, but the parameter isn't being passed.