chore(ExpandableSection): Include OUIAProps for ExpandableSection

[mshriver]

Add OUIA attribute support to ExpandableSection for better test automation.

What:
Closes #12569

Snapshot tests commit
#12573
https://github.com/patternfly/patternfly-react/pull/12574/changes

Summary by CodeRabbit

• New Features

  • Added Open UI Automation attributes to the Expandable Section component.
  • Supports custom component IDs and configurable safe-mode behavior.
  • Expandable Sections now expose a standardized component type for automation tools.

• Documentation

  • Added Expandable Section to the Open UI Automation component guide.

[coderabbitai]

Walkthrough

ExpandableSection now accepts OUIA properties, defaults ouiaSafe to true, and applies generated OUIA attributes to its root element. Tests cover custom IDs, component type, and safe-mode behavior, while the OUIA guide lists ExpandableSection.

Changes

ExpandableSection OUIA support

Layer / File(s)	Summary
OUIA contract and rendering packages/react-core/src/components/ExpandableSection/ExpandableSection.tsx	ExpandableSectionProps now extends OUIAProps, supports ouiaId and ouiaSafe, defaults safe mode to true, and spreads generated OUIA attributes onto the root container.
OUIA validation and documentation packages/react-core/src/components/ExpandableSection/__tests__/ExpandableSection.test.tsx, packages/react-core/src/helpers/OUIA/OUIA.md	Tests verify OUIA IDs, component type, and safe-mode values; the component is added to the OUIA guide.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• patternfly/patternfly-react#12426: Adds comparable OUIA props and generated root attributes to another PatternFly component.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The PR adds OUIA prop support and tests for ExpandableSection, matching issue #12569.
Out of Scope Changes check	✅ Passed	The changes stay focused on ExpandableSection OUIA support, related tests, and the matching docs update.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: adding OUIAProps support to ExpandableSection.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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