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Restore EETypeNode to the state before we deleted reflection blocking
Contributes to dotnet#91704. When we deleted reflection blocking in dotnet#85810 we had to update `EETypeNode`/`ConstructedEETypeNode` to ensure any `MethodTable` also has metadata (constructed or not). This was needed because of how reflection was structured - we couldn't create a `RuntimeType` without knowing about the metadata. After the refactor in dotnet#93440, metadata is no longer a prerequisite to constructing a `RuntimeType`. The compiler can go back to optimizing away the metadata. This affects things like `typeof(Foo) == bar.GetType()`. No metadata is needed for this (and we do optimized the `Foo` MethodTable to unconstructed one) but we still had to generate metadata. Besides the rollback of EEType to the previous shape, this also has a bugfix for dotnet#91988 that was found later - interface types used in cast/dispatch should be considered constructed. I'm seeing 0.1 - 0.7% size saving.
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