Explicitly implement syntacticTestItems in DocumentationLanguageService
#2278
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SyntacticTestIndexqueries all language services for a document for its syntactic test items. This causedsyntacticDocumentTests not implemented in DocumentationLanguageServiceto be logged for every Swift file in the project. Remove the default implementation ofsyntacticDocumentTestsinLanguageServiceand instead provide an implementation that returns an empty array inDocumentationLanguageService.While at it, also log the files for which unimplemented methods are called on
LanguageService. This makes it easier to dermine why they are called.