Fix DAM attributes in ValidationAttributeCache to include PublicConstructors

[Copilot]

The Validations source generator was emitting IL2075 warnings because the GetValidationAttributes method calls Type.GetConstructors() but the Type parameters only had DynamicallyAccessedMemberTypes.PublicProperties annotations.

The warning was:

ValidatableInfoResolver.g.cs(323,45): warning IL2075: 'this' argument does not satisfy 'DynamicallyAccessedMemberTypes.PublicConstructors' in call to 'System.Type.GetConstructors()'. The return value of method 'Microsoft.Extensions.Validation.Generated.ValidationAttributeCache.CacheKey.ContainingType.get' does not have matching annotations. The source value must declare at least the same requirements as those declared on the target location it is assigned to.

Root Cause

In ValidationsGenerator.Emitter.cs, the ValidationAttributeCache.GetValidationAttributes method and related types used DynamicallyAccessedMemberTypes.PublicProperties but the generated code also calls GetConstructors() to handle record scenarios where validation attributes may be on constructor parameters.

Changes Made

Updated the DynamicallyAccessedMembers attributes in 4 locations to include both PublicProperties | PublicConstructors:

1. CacheKey record property annotation
2. GetValidationAttributes method parameter annotation
3. GeneratedValidatablePropertyInfo constructor parameter annotation
4. GeneratedValidatablePropertyInfo.ContainingType property annotation

This ensures the Type parameters have the correct annotations that match their actual usage pattern of accessing both properties (via GetProperty) and constructors (via GetConstructors).

Testing

• All existing tests pass
• Updated test snapshots to reflect the corrected generated code
• Verified the IL2075 warning is resolved

Fixes #62655.

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