Provide a single interface for adding suggestions

In order to add a suggestion you now need to:
1. Create a suggestion and specs
2. Add suggestion class to SUGGESTIONS constant
3. There is no step 3

danger/specs/Dangerfile

@@ -55,7 +55,5 @@ if helper.changes.added.files.grep(%r{^(ee/)?spec/controllers/}).any?
 end
 
 specs.changed_specs_files.each do |filename|
-  specs.add_suggestions_for_match_with_array(filename)
-  specs.add_suggestions_for_project_factory_usage(filename)
-  specs.add_suggestions_for_feature_category(filename)
+  specs.add_suggestions_for(filename)
 end

spec/tooling/danger/specs/feature_category_suggestion_spec.rb

@@ -94,6 +94,6 @@
       expect(specs).to receive(:markdown).with(comment, file: filename, line: test_case[:number])
     end
 
-    specs.add_suggestions_for_feature_category(filename)
+    specs.add_suggestions_for(filename)
   end
 end

spec/tooling/danger/specs/match_with_array_suggestion_spec.rb

@@ -94,6 +94,6 @@
       expect(specs).to receive(:markdown).with(comment, file: filename, line: test_case[:number])
     end
 
-    specs.add_suggestions_for_match_with_array(filename)
+    specs.add_suggestions_for(filename)
   end
 end

spec/tooling/danger/specs/project_factory_suggestion_spec.rb

@@ -99,6 +99,6 @@
       expect(specs).to receive(:markdown).with(comment, file: filename, line: test_case[:number])
     end
 
-    specs.add_suggestions_for_project_factory_usage(filename)
+    specs.add_suggestions_for(filename)
   end
 end

tooling/danger/specs.rb

 # frozen_string_literal: true
 
-require_relative 'specs/match_with_array_suggestion'
-require_relative 'specs/project_factory_suggestion'
-require_relative 'specs/feature_category_suggestion'
+Dir[File.expand_path('specs/*_suggestion.rb', __dir__)].each { |file| require file }
 
 module Tooling
   module Danger
     module Specs
-      include ::Tooling::Danger::Suggestor
-
       SPEC_FILES_REGEX = 'spec/'
       EE_PREFIX = 'ee/'
 
+      SUGGESTIONS = [
+        FeatureCategorySuggestion,
+        MatchWithArraySuggestion,
+        ProjectFactorySuggestion
+      ].freeze
+
       def changed_specs_files(ee: :include)
         changed_files = helper.all_changed_files
         folder_prefix =
@@ -27,16 +29,10 @@ def changed_specs_files(ee: :include)
         changed_files.grep(%r{\A#{folder_prefix}#{SPEC_FILES_REGEX}})
       end
 
-      def add_suggestions_for_match_with_array(filename)
-        MatchWithArraySuggestion.new(filename, context: self).suggest
-      end
-
-      def add_suggestions_for_project_factory_usage(filename)
-        ProjectFactorySuggestion.new(filename, context: self).suggest
-      end
-
-      def add_suggestions_for_feature_category(filename)
-        FeatureCategorySuggestion.new(filename, context: self).suggest
+      def add_suggestions_for(filename)
+        SUGGESTIONS.each do |suggestion|
+          suggestion.new(filename, context: self).suggest
+        end
       end
     end
   end