[TreeView] Split the tests in feature-based files and run them on both SimpleTreeView and RichTreeView, with both TreeItem and TreeItem2

[flaviendelangle]

• [core] Introduce describeTreeView to run test on SimpleTreeView and RichTreeView, using TreeItem and TreeItem2 + migrate expansion tests #12428
• [core] Use describeTreeView for selection tests #12647
• [core] Use describeTreeView for icons tests #12672
• [core] Use describeTreeView for focus tests #12698
• [core] Use describeTreeView in existing tests for useTreeViewItems #12732
• [core] Use describeTreeView for type-ahead tests #12811
• [core] Use describeTreeView for items test (partial) #12893
• [core] Use describeTreeView for navigation tests #12907
• [core] Use describeTreeView for keyboard selection tests #13164
• [test] Use describeTreeView for items rendering edge-case tests #13168
• [test] Use describeTreeView for keyboard navigation tests on disabled items #13184
• [test] Use describeTreeView for remaining items tests #13262

[github-actions]

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