[mlir][tensor] Fix bug in insert_slice canonical. with tensor encoding (#81045) Previously, `InsertSliceOpSourceCastInserter` was incorrectly applied to a case when tensor types have an encoding attribute attached to them. The type `newSrcType` was missing that attribute from the old `srcType`, which made the expression `srcType == newSrcType` false, since `tensor<2x2xf32, "foo">` is not equal to `tensor<2x2xf32>`. That lead to an endless back and forth between `InsertSliceOpSourceCastInserter` that would introduce a cast and `InsertSliceOpCastFolder` that would remove it right after.
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