fix(OutlinedCalendarAltIcon): Replace OutlinedCalendarAltIcon

[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
  • Replaced the calendar icon used in DatePicker and DateTimePicker components with an updated UI calendar icon.
• Documentation
  • Updated the DateTimePicker demo to reflect the new calendar icon in examples and docs.

[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: 29467de0-9d5a-4a2f-99db-a7f9473cd3d1

📥 Commits

Reviewing files that changed from the base of the PR and between 057ec2f and dd212a6.

⛔ Files ignored due to path filters (1)

• packages/react-core/src/components/DatePicker/__tests__/__snapshots__/DatePicker.test.tsx.snap is excluded by !**/*.snap

📒 Files selected for processing (3)

• packages/react-core/src/components/DatePicker/DatePicker.tsx
• packages/react-core/src/demos/DateTimePicker.md
• packages/react-core/src/demos/examples/DateTimePicker/DateTimePicker.tsx

🚧 Files skipped from review as they are similar to previous changes (3)

• packages/react-core/src/demos/DateTimePicker.md
• packages/react-core/src/components/DatePicker/DatePicker.tsx
• packages/react-core/src/demos/examples/DateTimePicker/DateTimePicker.tsx

---

Walkthrough

Replaces OutlinedCalendarAltIcon with RhUiCalendarIcon in the DatePicker component, DateTimePicker example, and demo documentation (imports and Button icon prop).

Changes

Calendar icon replacement

Layer / File(s)	Summary
Replace calendar icon in DatePicker components and demos packages/react-core/src/components/DatePicker/DatePicker.tsx, packages/react-core/src/demos/examples/DateTimePicker/DateTimePicker.tsx, packages/react-core/src/demos/DateTimePicker.md	Updated imports and Button icon prop usage from OutlinedCalendarAltIcon to RhUiCalendarIcon across the DatePicker component, DateTimePicker example, and demo markdown.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Suggested labels

Needs design review

Suggested reviewers

• nicolethoen
• kmcfaul
• thatblindgeye

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Title check	❓ Inconclusive	The title describes replacing OutlinedCalendarAltIcon but is incomplete—it doesn't specify the replacement icon (RhUiCalendarIcon) or clearly communicate the full scope of the change.	Consider a more complete title like 'fix: Replace OutlinedCalendarAltIcon with RhUiCalendarIcon' to clearly indicate both what was replaced and what it was replaced with.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
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-12463.surge.sh

A11y report: https://pf-react-pr-12463-a11y.surge.sh