Merge branch 'remove-flowdock-model' into 'master'

Remove Flowdock model

See merge request !108032



Merged-by: Alper Akgun <aakgun@gitlab.com>
Approved-by: Bojan Marjanovic <bmarjanovic@gitlab.com>
Approved-by: Alper Akgun <aakgun@gitlab.com>
Reviewed-by: Bojan Marjanovic <bmarjanovic@gitlab.com>
Co-authored-by: Arturo Herrero <arturo.herrero@gmail.com>

app/models/integrations/flowdock.rb

-# frozen_string_literal: true
-
-# This integration is scheduled for removal.
-# All records must be deleted before the class can be removed.
-# https://gitlab.com/gitlab-org/gitlab/-/issues/379197
-module Integrations
-  class Flowdock < Integration
-    def readonly?
-      true
-    end
-
-    def self.to_param
-      'flowdock'
-    end
-
-    def self.supported_events
-      %w[]
-    end
-  end
-end