fix(CalendarAltIcon): Replace CalendarAltIcon with RhUiCalendarIcon

[rebeccaalpert]

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

Additional issues:

Summary by CodeRabbit

• Style
  • Updated calendar icon in InputGroup component examples and demo applications to use the latest icon version.

[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: 21231c14-7d73-4307-be1e-93492b8a5c4c

📥 Commits

Reviewing files that changed from the base of the PR and between 8b528bb and 30abf9f.

📒 Files selected for processing (2)

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

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Walkthrough

This PR updates the calendar icon used in InputGroup examples and demonstrations. The icon reference changes from CalendarAltIcon to RhUiCalendarIcon in the example markdown file and the demo component, including both the import statement and the rendered icon within the date input's label.

Changes

Calendar Icon Update

Layer / File(s)	Summary
Calendar icon import and usage updates packages/react-integration/demo-app-ts/src/components/demos/InputGroupDemo/InputGroupDemo.tsx, packages/react-core/src/components/InputGroup/examples/InputGroup.md	Import statements and icon usage are updated from CalendarAltIcon to RhUiCalendarIcon across the demo component and example markdown.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Suggested labels

Needs design review

Suggested reviewers

• kmcfaul
• nicolethoen
• phcox
• 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 clearly and specifically describes the main change: replacing CalendarAltIcon with RhUiCalendarIcon across the codebase, which is directly reflected in the modified files.
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-12462.surge.sh

A11y report: https://pf-react-pr-12462-a11y.surge.sh