1. Extract the main logic from `foldTensorCastPrecondition` into a
dedicated helper hook: `hasFoldableTensorCastOperand`. This allows
for reusing the corresponding checks.
2. Rename `getNewOperands` to `getUpdatedOperandsAfterCastOpFolding` for
better clarity and documentation of its functionality.
3. These updated hooks will be reused in:
* https://github.com/llvm/llvm-project/pull/123902. This PR makes
them public.
**Note:** Moving these hooks to `Tensor/Utils` is not feasible because
`MLIRTensorUtils` depends on `MLIRTensorDialect` (CMake targets). If
these hooks were moved to `Utils`, it would create a dependency of
`MLIRTensorDialect` on `MLIRTensorUtils`, leading to a circular
dependency.
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