[mlir][Transforms] `ConversionPatternRewriter`: Add `config` getter (#152310)HEADmain

Add a helper function to `ConversionPatternRewriter` that returns the
dialect conversion configuration. This flag is useful when migrating
conversion patterns to the new One-Shot Conversion Driver: patterns can
check if they are running in rollback mode or not. They can then work
around API changes and makes sure that the pattern keeps working with
both the old and new driver.

Also remove the `config` field from `OperationLegalizer`. That field was
never needed.

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