[JIT] Fix - Do not remove `CAST` nodes on store if the `LCL_VAR` is a parameter or...

[JIT] Fix - Do not remove `CAST` nodes on store if the `LCL_VAR` is a parameter or struct field (#85734)

* Do not remove CAST nodes on assignment if the LCL_VAR is a parameter.

* Added NormalizeOnLoad rules from SingleAccretion. Added description of why we cannot remove CAST nodes from parameters.

* Remove morph optimization for NormalizeOnLoad in fgMorphLocalVar. Update test.

* Do not OptimizeCastOnStore for params and struct fields

* Update src/coreclr/jit/morph.cpp

Co-authored-by: Jakob Botsch Nielsen <Jakob.botsch.nielsen@gmail.com>
* Formatting

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Co-authored-by: Jakob Botsch Nielsen <Jakob.botsch.nielsen@gmail.com>