[mono] Don't throw inheritance error on interfaces in GetCustomAttrs #33942
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Fixes #33639
Looking at #7190, the .NET Core behavior here is strange and my changes in 0844cb7a6152 with the type checking may have been a mistake. I think this should be fine with the interface special-casing, but if deemed too great a concern I can revert that subset of my old changes. Additionally, if people come up with other scenarios where this might fail, I'll just revert until we can migrate to use a shared CustomAttribute implementation rather than try to play whack-a-mole.