fix(UserIcon): Replace UserIcon with RhUiProfileFillIcon

[rebeccaalpert]

What:
This is one piece of #12400. Breaking it up by icon so it is easier to review.

Additional issues:

Summary by CodeRabbit

• Chores
  • Updated icon components used in documentation examples and demo applications.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 32323f18-9385-469d-84c1-8b453e592a8e

📥 Commits

Reviewing files that changed from the base of the PR and between a72042e and e47af71.

⛔ Files ignored due to path filters (2)

• packages/react-core/src/components/EmptyState/__tests__/Generated/EmptyStateIcon.test.tsx is excluded by !**/generated/**
• packages/react-core/src/components/EmptyState/__tests__/Generated/__snapshots__/EmptyStateIcon.test.tsx.snap is excluded by !**/*.snap, !**/generated/**

📒 Files selected for processing (2)

• packages/react-core/src/components/Nav/examples/Nav.md
• packages/react-integration/demo-app-ts/src/components/demos/AlertDemo/AlertDemo.tsx

Walkthrough

This PR replaces the UserIcon import with RhUiProfileFillIcon across examples and demo components. The Nav documentation example and the AlertDemo component are both updated to import and use the new icon.

Changes

Icon Replacement

Layer / File(s)	Summary
UserIcon to RhUiProfileFillIcon replacement packages/react-core/src/components/Nav/examples/Nav.md, packages/react-integration/demo-app-ts/src/components/demos/AlertDemo/AlertDemo.tsx	Icon import and usage are replaced from UserIcon to RhUiProfileFillIcon in Nav.md example documentation and AlertDemo component import and customIcon prop.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Suggested labels

Needs design review

Suggested reviewers

• nicolethoen
• kmcfaul
• thatblindgeye
• wise-king-sullyman

🚥 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 and specifically summarizes the main change: replacing UserIcon with RhUiProfileFillIcon across the codebase.
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-12452.surge.sh

A11y report: https://pf-react-pr-12452-a11y.surge.sh