[mlir][Arm] Fix invalid rewrite pattern API violations (#78246)

This commit fixes rewrite pattern API violations:
* Rewrite pattern must return "failure" if the IR was not modified.
* In-place op modifications must be communicated to the rewriter
(`updateRootInPlace`).

This commit fixes `test/Dialect/ArmSVE/legalize-vector-storage.mlir`,
`test/Dialect/ArmSME/vector-ops-to-llvm.mlir`,
`test/Dialect/ArmSME/tile-allocation-invalid.mlir`,
`test/Conversion/ArmSMEToLLVM/arm-sme-to-llvm.mlir`,
`test/Conversion/ArmSMEToLLVM/tile-spills-and-fills.mlir`,
`test/Conversion/ArmSMEToLLVM/unsupported.mlir` when running with
`MLIR_ENABLE_EXPENSIVE_PATTERN_API_CHECKS`.

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Co-authored-by: Benjamin Maxwell <macdue@dueutil.tech>