[mlir][Transforms] Dialect conversion: Add missing erasure notifications (#145030) Add missing listener notifications when erasing nested blocks/operations. This commit also moves some of the functionality from `ConversionPatternRewriter` to `ConversionPatternRewriterImpl`. This is in preparation of the One-Shot Dialect Conversion refactoring: The implementations in `ConversionPatternRewriter` should be as simple as possible, so that a switch between "rollback allowed" and "rollback not allowed" can be inserted at that level. (In the latter case, `ConversionPatternRewriterImpl` can be bypassed to some degree, and `PatternRewriter::eraseBlock` etc. can be used.) Depends on #145018.
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