Rename `conditionally_graphql!` to `run_graphql!`

And remove the unnecessary `fallback` parameter

lib/api/helpers/graphql_helpers.rb

@@ -6,7 +6,7 @@ module API
     # against the graphql API. Helper code for the graphql server implementation
     # should be in app/graphql/ or lib/gitlab/graphql/
     module GraphqlHelpers
-      def conditionally_graphql!(fallback:, query:, context: {}, transform: nil)
+      def run_graphql!(query:, context: {}, transform: nil)
         result = GitlabSchema.execute(query, context: context)
 
         if transform

lib/api/version.rb

@@ -19,11 +19,10 @@ module API
       detail 'This feature was introduced in GitLab 8.13.'
     end
     get '/version' do
-      conditionally_graphql!(
+      run_graphql!(
         query: METADATA_QUERY,
         context: { current_user: current_user },
-        transform: ->(result) { result.dig('data', 'metadata') },
-        fallback: -> { { version: Gitlab::VERSION, revision: Gitlab.revision } }
+        transform: ->(result) { result.dig('data', 'metadata') }
       )
     end
   end