Make domain block/silence/reject-media code more robust (#13424)

* Split media cleanup from reject-media domain blocks to its own service

* Slightly improve ClearDomainMediaService error handling

* Lower DomainClearMediaWorker to lowest-priority queue

* Do not catch ActiveRecord::RecordNotFound in domain block workers

* Fix DomainBlockWorker spec labels

* Add some specs

* Change domain blocks to immediately mark accounts as suspended

Rather than doing so sequentially, account after account, while cleaning
their data. This doesn't change much about the time the block takes to
complete, but it immediately prevents interaction with the blocked domain,
while up to now, it would only be guaranteed when the process ends.

spec/workers/domain_block_worker_spec.rb

@@ -8,7 +8,7 @@ describe DomainBlockWorker do
   describe 'perform' do
     let(:domain_block) { Fabricate(:domain_block) }
 
-    it 'returns true for non-existent domain block' do
+    it 'calls domain block service for relevant domain block' do
       service = double(call: nil)
       allow(BlockDomainService).to receive(:new).and_return(service)
       result = subject.perform(domain_block.id)
@@ -17,7 +17,7 @@ describe DomainBlockWorker do
       expect(service).to have_received(:call).with(domain_block, false)
     end
 
-    it 'calls domain block service for relevant domain block' do
+    it 'returns true for non-existent domain block' do
       result = subject.perform('aaa')
 
       expect(result).to eq(true)

spec/workers/domain_clear_media_worker_spec.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe DomainClearMediaWorker do
+  subject { described_class.new }
+
+  describe 'perform' do
+    let(:domain_block) { Fabricate(:domain_block, severity: :silence, reject_media: true) }
+
+    it 'calls domain clear media service for relevant domain block' do
+      service = double(call: nil)
+      allow(ClearDomainMediaService).to receive(:new).and_return(service)
+      result = subject.perform(domain_block.id)
+
+      expect(result).to be_nil
+      expect(service).to have_received(:call).with(domain_block)
+    end
+
+    it 'returns true for non-existent domain block' do
+      result = subject.perform('aaa')
+
+      expect(result).to eq(true)
+    end
+  end
+end