DEV: Allow custom value when pausing sidekiq to aid in debugging.

Sometimes, it is useful to know what caused Sidekiq to be paused.

spec/multisite/pausable_spec.rb

@@ -17,7 +17,7 @@ RSpec.describe "Pausing/Unpausing Sidekiq", type: :multisite do
       expect(Sidekiq.paused?).to eq(false)
 
       test_multisite_connection('second') do
-        Sidekiq.pause!
+        Sidekiq.pause!("test")
         expect(Sidekiq.paused?).to eq(true)
       end