Fix incorrect namespacing of Resolvers::ValidateCodeownerFileResolver

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Currently the Resolvers::ValidateCodeownerFileResolver is incorrectly namespaced in the EE namespace. This namespace is reserved for CE extensions but this resolver is an EE only class not a CE extension.

While we're moving this we should also fix the naming. It should either be ValidateCodeownersFileResolver or ValidateCodeOwnersFileResolver.

Either way makes sense IMO. We're either validating the CODEOWNERS file or the file for the Code Owners feature. As we can't uppercase the whole word I'd personally lean towards ValidateCodeOwnersFileResolver

The main thing here is the namespacing so wouldn't worry to much about the naming.