[NativeAOT] Remove unnecessary [DynamicDependency] attributes

[simonrozsival]

This is a follow-up to #18666

This PR resolves the following warnings that I've seen in build logs when running MySingleView with NativeAOT:

ILLink : warning IL2034: <Module>..cctor(): The 'DynamicDependencyAttribute' could not be analyzed. [/..../xamarin/xamarin-macios/tests/dotnet/MySingleView/MySingleView.csproj]
ILLink : warning IL2034: <Module>..cctor(): The 'DynamicDependencyAttribute' could not be analyzed. [/..../xamarin/xamarin-macios/tests/dotnet/MySingleView/MySingleView.csproj]
...

The generated module cctor code looks like this:

internal class <Module>
{
	[DynamicDependency("InvokeConformsToProtocol(ObjCRuntime.NativeHandle)", typeof(NSObject))]
	[DynamicDependency("Foundation.NSObject", null)]
	[DynamicDependency("ConformsToProtocol(ObjCRuntime.NativeHandle)", typeof(NSObject))]
	[DynamicDependency("Foundation.NSObject", null)]
        // ...
	static <Module>()
	{
		// ...
	}
}

The [DynamicDependency("T", null)] attributes are invalid. We could change them to [DynamicDependency(DynamicallyAccessedMemberTypes.None, typeof(T))] but I think that attribute is redundant because the type itself is always already preserved through the attribute that precedes it with a selector of one of its methods/fields.

[rolfbjarne]

This changes the original code to mark Preserved code, so I'm not sure I'm comfortable with that.

Could we instead just skip adding the attribute in the AddDynamicDependencyAttribute method below instead?

[simonrozsival]

I see, I will change the PR to only skip the DynamicDependency attribute and keep the original marking logic.

[github-actions]

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I updated the code, please have another look.