fix(UsersIcon): Replace with brand icon

[rebeccaalpert]

What:
This is part of #12400.

Additional issues:

Summary by CodeRabbit

• Refactor
  • Updated icon references in Alert and Tabs component examples, documentation, and demo applications for consistency across the library.
  • Changes applied to example files in core packages and integration demo applications.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 414e66a6-7656-4ad2-94fb-a41bffa3762f

📥 Commits

Reviewing files that changed from the base of the PR and between 2a43d99 and 8c75f1c.

📒 Files selected for processing (7)

• packages/react-core/src/components/Alert/examples/Alert.md
• packages/react-core/src/components/Alert/examples/AlertCustomIcons.tsx
• packages/react-core/src/components/Tabs/examples/Tabs.md
• packages/react-core/src/components/Tabs/examples/TabsFilledWithIcons.tsx
• packages/react-core/src/components/Tabs/examples/TabsIconAndText.tsx
• packages/react-integration/demo-app-ts/src/components/demos/TabsDemo/TabsDemo.tsx
• packages/react-integration/demo-app-ts/src/components/demos/TabsDemo/TabsUncontrolledDemo.tsx

✅ Files skipped from review due to trivial changes (2)

• packages/react-core/src/components/Tabs/examples/TabsIconAndText.tsx
• packages/react-core/src/components/Alert/examples/Alert.md

🚧 Files skipped from review as they are similar to previous changes (4)

• packages/react-integration/demo-app-ts/src/components/demos/TabsDemo/TabsUncontrolledDemo.tsx
• packages/react-core/src/components/Tabs/examples/Tabs.md
• packages/react-core/src/components/Alert/examples/AlertCustomIcons.tsx
• packages/react-integration/demo-app-ts/src/components/demos/TabsDemo/TabsDemo.tsx

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Walkthrough

This PR systematically replaces the deprecated UsersIcon with RhUiUsersFillIcon across Alert and Tabs component examples, documentation, and demo applications. All changes are import and usage updates with no behavioral modifications.

Changes

Icon Migration

Layer / File(s)	Summary
Alert component examples packages/react-core/src/components/Alert/examples/Alert.md, packages/react-core/src/components/Alert/examples/AlertCustomIcons.tsx	Alert documentation import and AlertCustomIcons component are updated to replace UsersIcon with RhUiUsersFillIcon.
Tabs component examples packages/react-core/src/components/Tabs/examples/Tabs.md, packages/react-core/src/components/Tabs/examples/TabsFilledWithIcons.tsx, packages/react-core/src/components/Tabs/examples/TabsIconAndText.tsx	Tabs documentation and example components are updated to import and render RhUiUsersFillIcon for the Users tab icon.
Demo app Tabs components packages/react-integration/demo-app-ts/src/components/demos/TabsDemo/TabsDemo.tsx, packages/react-integration/demo-app-ts/src/components/demos/TabsDemo/TabsUncontrolledDemo.tsx	Demo app Tabs components are updated to use RhUiUsersFillIcon for Tab item 3 titles.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Suggested labels

Needs design review

Suggested reviewers

• nicolethoen
• thatblindgeye
• kmcfaul

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly indicates the main change: replacing UsersIcon with a brand icon (RhUiUsersFillIcon) across multiple components and examples.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[patternfly-build]

Preview: https://pf-react-pr-12450.surge.sh

A11y report: https://pf-react-pr-12450-a11y.surge.sh