Fix locals initialization of generic instance type

[josesimoes]

Description

• Local var of a generic type is now correctly instantiated. Not using the TypeSpec anymore. Not initializing it as object data type anymore.
• Revert changes from Fix load and store field IL instructions for value types in stack #3186 as now locals of generic instances (value types included) are now initialized and properly stored.

Motivation and Context

How Has This Been Tested?

• Running MDP unit tests and sample app with implementation of Span<T>.
• Tested against Merge generics support in mscorlib CoreLibrary#245
  [build with MDP buildId 56229]

Screenshots

Types of changes

• Improvement (non-breaking change that improves a feature, code or algorithm)
• Bug fix (non-breaking change which fixes an issue with code or algorithm)
• New feature (non-breaking change which adds functionality to code)
• Breaking change (fix or feature that would cause existing functionality to change)
• Config and build (change in the configuration and build system, has no impact on code or features)
• Dev Containers (changes related with Dev Containers, has no impact on code or features)
• Dependencies/declarations (update dependencies or assembly declarations and changes associated, has no impact on code or features)
• Documentation (changes or updates in the documentation, has no impact on code or features)

Checklist

• My code follows the code style of this project (only if there are changes in source code).
• My changes require an update to the documentation (there are changes that require the docs website to be updated).
• I have updated the documentation accordingly (the changes require an update on the docs in this repo).
• I have read the CONTRIBUTING document.
• I have tested everything locally and all new and existing tests passed (only if there are changes in source code).

Summary by CodeRabbit

• Refactor
  • Improved handling and parsing of generic instance types during local variable initialization for more accurate type assignment.
  • Simplified and unified the process of extracting object data types during field load and store operations, reducing complexity and special-case handling.

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Walkthrough

The changes update the handling of generic instance type initialization in local variables and simplify object data type extraction in the interpreter. Special case logic for generic instances and by-reference types is removed, replaced by unified parsing and extraction methods. No exported or public entity signatures are modified.

Changes

File(s)	Change Summary
src/CLR/Core/Execution.cpp	Replaces special case handling of generic instance local variables with signature parsing for type extraction.
src/CLR/Core/Interpreter.cpp	Removes conditional logic for by-reference and special types in field load/store; uses unified extraction function.

Sequence Diagram(s)

sequenceDiagram
    participant ExecutionEngine
    participant SignatureParser
    participant TypeDescriptor

    ExecutionEngine->>SignatureParser: Parse TypeSpec for local variable (generic instance)
    SignatureParser-->>ExecutionEngine: Return class and data type
    ExecutionEngine->>TypeDescriptor: Initialize local variable with parsed type

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sequenceDiagram
    participant Interpreter
    participant TypeDescriptor

    Interpreter->>TypeDescriptor: Extract object and data type (CEE_LDFLD/CEE_STFLD)
    TypeDescriptor-->>Interpreter: Return object and data type
    Interpreter->>Interpreter: Proceed with field load/store using extracted type

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[josesimoes]

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