feat(table): add indexBy prop for ID-based expansion tracking

[platex-rehor-bot]

Summary

Adds an optional indexBy prop to DataViewTableBasic and DataViewTableTree components. When provided, expanded row state is tracked by a stable data property (e.g., id) instead of the array index, so expansion follows the correct row through sorting, filtering, and pagination.

Closes #677

RHCLOUD-48835

Changes

• DataViewTableBasic: Added indexBy prop. When set, expansion state (expandedRowsState, expandedColumnIndex) is keyed by the resolved row property instead of rowIndex. ExpandableContent.rowId type widened to string | number.
• DataViewTableTree: Added indexBy prop. When set, getNodeId() resolves node identity from the specified property instead of the default id field.
• DataViewTable: indexBy prop passes through to both basic and tree variants via their existing prop interfaces.
• Backward compatible — omitting indexBy preserves current index-based behavior.

Usage

<DataViewTable
  indexBy="id"
  rows={rows.map(repo => ({ row: [...], id: repo.id }))}
  isExpandable
  expandedRows={[{ rowId: "repo-1", columnId: 1, content: <Details /> }]}
/>

Test plan

• Existing 10 tests pass unchanged (5 basic + 5 tree)
• 3 new DataViewTableBasic tests: render with indexBy, expandable with indexBy uses row ID, default behavior preserved
• 2 new DataViewTableTree tests: render with indexBy, expandAll with indexBy
• ESLint: 0 errors (only pre-existing warnings)

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