Fix SemanticsAction naming consistency (#32411) Removes the `Index` suffix from kMoveCursorForwardByWord and kMoveCursorBackwardByWord values in the SemanticsAction enum. These were erroneously copied as-is from the private class members in the dart:ui implementation in lib/ui/semantics/semantics.dart where the class members refer to the enum index here. This removes the trailing `Index` for consistency with the other enum members here. This is also useful in the context of automated testing for API consistency between these enums, the ones in dart:ui (native and web implementations) and the embedder API. Issue: https://github.com/flutter/flutter/issues/101217
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