Fix source generator emitting enum members as numeric values

[glen-84]

No description provided.

[Copilot]

Pull request overview

Fixes a bug in the Types.Analyzers source generator where enum-typed attribute arguments were emitted as EnumType.<numericValue> (e.g., Visibility.1), producing invalid C#. The new helper resolves the numeric value back to a named enum member, falling back to a numeric cast ((EnumType)value) when no single member matches (e.g., bitwise combinations of [Flags] values).

Changes:

• Introduce FormatEnumConstant that looks up enum field names by their constant value.
• Replace the inline enum formatting in FormatTypedConstant with a call to the new helper.
• Add an analyzer test plus snapshot covering enum and [Flags] enum arguments on a custom attribute applied to a resolver parameter.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/HotChocolate/Core/src/Types.Analyzers/FileBuilders/TypeFileBuilderBase.cs	Resolves enum constants to their member names; falls back to numeric cast.
src/HotChocolate/Core/test/Types.Analyzers.Tests/ObjectTypeTests.cs	New test verifying generation for enum and [Flags] attribute arguments.
src/HotChocolate/Core/test/Types.Analyzers.Tests/snapshots/ObjectTypeTests.CustomAttribute_With_Enum_And_Flags_Arguments_On_Parameter_MatchesSnapshot.md	New snapshot demonstrating the corrected emission (enum members by name, flags combination as (Enum)3).

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