Add unit test coverage for TypeFullNameComparer and SharedTypeExtensions

[ilkertskn]

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[ilkertskn]

Add unit test coverage for TypeFullNameComparer and SharedTypeExtensions

• Add TypeFullNameComparerTest covering Compare/Equals/GetHashCode and null handling
• Add SharedTypeExtensionsTest covering previously-untested type helpers: UnwrapNullableType,
  MakeNullable, IsNumeric, IsSignedInteger, UnwrapEnumType, IsScalarType, IsInstantiable,
  IsValidEntityType, IsCompatibleWith, GetTypesInHierarchy, GetBaseTypesAndInterfacesInclusive
• I've read the guidelines for contributing and seen the walkthrough
• I've posted a comment on an issue with a detailed description of how I am planning to contribute and got approval from a member of the team
• The code builds and tests pass locally (also verified by our automated build checks)
• Commit messages follow this format
• Tests for the changes have been added (this PR is test-only: adds missing coverage)
• Code follows the same patterns and style as existing code in this repo

[Copilot]

Pull request overview

Adds focused unit tests for two shared/core utility components used throughout EF Core: TypeFullNameComparer (type ordering/equality) and SharedTypeExtensions (various System.Type helpers). This improves confidence in these low-level helpers without changing production behavior.

Changes:

• Added unit tests validating TypeFullNameComparer ordering, null-handling, equality, and singleton instance behavior.
• Added unit tests covering key SharedTypeExtensions behaviors (nullable/enum handling, numeric/scalar checks, compatibility, and type hierarchy helpers).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
test/EFCore.Tests/Internal/TypeFullNameComparerTest.cs	New unit tests for TypeFullNameComparer compare/equality/hash behavior and edge cases (null/reference/culture-vs-ordinal).
test/EFCore.Tests/Extensions/SharedTypeExtensionsTest.cs	New unit tests for SharedTypeExtensions Type helper methods (nullability, numeric/scalar, compatibility, hierarchy).

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