fix(CalendarIcon): Replace CalendarIcon with RhUiCalendarFillIcon

[rebeccaalpert]

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

Additional issues:

Summary by CodeRabbit

Documentation

• Updated TextInput component examples to use an updated calendar icon implementation across custom icon and invalid state variations.

[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: eaa652a3-759b-4ab9-8dfe-189bac9e29a8

📥 Commits

Reviewing files that changed from the base of the PR and between 8b528bb and 72a83e4.

📒 Files selected for processing (3)

• packages/react-core/src/components/TextInput/examples/TextInput.md
• packages/react-core/src/components/TextInput/examples/TextInputCustomIcon.tsx
• packages/react-core/src/components/TextInput/examples/TextInputCustomIconInvalid.tsx

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Walkthrough

This pull request updates three TextInput example files to consistently use RhUiCalendarFillIcon instead of CalendarIcon. The documentation and component examples (TextInputCustomIcon and TextInputCustomIconInvalid) are modified to import and render the new icon.

Changes

TextInput icon examples update

Layer / File(s)	Summary
Icon replacement in TextInput examples and documentation packages/react-core/src/components/TextInput/examples/TextInput.md, packages/react-core/src/components/TextInput/examples/TextInputCustomIcon.tsx, packages/react-core/src/components/TextInput/examples/TextInputCustomIconInvalid.tsx	Documentation import and two example component files are updated to use RhUiCalendarFillIcon instead of CalendarIcon for both imports and the customIcon prop rendering.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• patternfly/patternfly-react#12378: Similar icon replacement pattern in Table examples where icon components are swapped (BlueprintIcon → RhUiBlueprintIcon).

Suggested labels

Needs design review

Suggested reviewers

• kmcfaul
• nicolethoen
• thatblindgeye

🚥 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 accurately describes the main change across all three modified files: replacing CalendarIcon with RhUiCalendarFillIcon in TextInput 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-12461.surge.sh

A11y report: https://pf-react-pr-12461-a11y.surge.sh