FIX: remove 'crawl_images' site setting (#14646)

spec/services/search_indexer_spec.rb

@@ -225,7 +225,6 @@ describe SearchIndexer do
 
     it 'should not include lightbox in search' do
       Jobs.run_immediately!
-      SiteSetting.crawl_images = true
       SiteSetting.max_image_width = 1
 
       stub_request(:get, "https://meta.discourse.org/some.png")

spec/services/user_anonymizer_spec.rb

@@ -153,6 +153,8 @@ describe UserAnonymizer do
 
       topic = Fabricate(:topic, user: user)
       quoted_post = create_post(user: user, topic: topic, post_number: 1, raw: "quoted post")
+
+      stub_image_size
       post = create_post(raw: <<~RAW)
         Lorem ipsum
 

spec/services/username_changer_spec.rb

@@ -107,6 +107,7 @@ describe UsernameChanger do
       end
 
       def create_post_and_change_username(args = {}, &block)
+        stub_image_size
         post = create_post(args.merge(topic_id: topic.id))
 
         args.delete(:revisions)&.each do |revision|