fix(LongArrowAltDown/UpIcon): Replace with microns versions

[rebeccaalpert]

What:
Part of #12402. Breaking into separate PRs so it is easier to review. I know this one is tiny but others are large.

Additional issues:

Summary by CodeRabbit

Style

• Updated the down-arrow and up-arrow icons used in table sorting to a refreshed “RhMicrons” arrow set.
• Updated Icon component examples to use the matching “RhMicrons” down-arrow icon.

Documentation

• Refreshed the Icon examples documentation to reflect the new “RhMicrons” arrow icon import.

[coderabbitai]

Walkthrough

Replaces LongArrowAltDownIcon and LongArrowAltUpIcon with RhMicronsArrowDownIcon and RhMicronsArrowUpIcon across the IconBasic example, its markdown documentation, and the SortColumn table component's sort-direction indicators.

Changes

Icon Replacement

Layer / File(s)	Summary
IconBasic example and docs packages/react-core/src/components/Icon/examples/Icon.md, packages/react-core/src/components/Icon/examples/IconBasic.tsx	Swaps the import and rendered usage of the down-arrow icon from LongArrowAltDownIcon to RhMicronsArrowDownIcon in both the example component and its markdown documentation.
SortColumn arrow icons packages/react-table/src/components/Table/SortColumn.tsx	Replaces LongArrowAltUpIcon and LongArrowAltDownIcon imports with RhMicronsArrowUpIcon and RhMicronsArrowDownIcon, and updates the SortedByIcon assignment to render the RhMicrons icons based on sort direction.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Suggested labels

Needs design review

Suggested reviewers

• 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.
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.
Title check	✅ Passed	The PR title directly reflects the main change: replacing LongArrowAltDown/UpIcon with their microns versions across multiple files.

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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-12517.surge.sh

A11y report: https://pf-react-pr-12517-a11y.surge.sh

[thatblindgeye]

Just to mention, the icon used in this PR is much easier to see than the RhUiLongArrow icons. I tried those locally and could barely tell it was an arrow up or down.