Refactor reply-fetching code and disable it by default (#34147)

spec/models/concerns/status/fetch_replies_concern_spec.rb

@@ -85,7 +85,6 @@ RSpec.describe Status::FetchRepliesConcern do
 
       it 'shows the status as unsubscribed' do
         expect(Status.unsubscribed).to eq([status])
-        expect(status.unsubscribed?).to be(true)
       end
     end
 
@@ -96,7 +95,6 @@ RSpec.describe Status::FetchRepliesConcern do
 
       it 'shows the status as unsubscribed' do
         expect(Status.unsubscribed).to eq([status])
-        expect(status.unsubscribed?).to be(true)
       end
     end
 
@@ -107,7 +105,6 @@ RSpec.describe Status::FetchRepliesConcern do
 
       it 'shows the status as unsubscribed' do
         expect(Status.unsubscribed).to eq([status])
-        expect(status.unsubscribed?).to be(true)
       end
     end
 
@@ -118,14 +115,12 @@ RSpec.describe Status::FetchRepliesConcern do
 
       it 'does not show the status as unsubscribed' do
         expect(Status.unsubscribed).to eq([])
-        expect(status.unsubscribed?).to be(false)
       end
     end
 
     context 'when the status has no followers' do
       it 'shows the status as unsubscribed' do
         expect(Status.unsubscribed).to eq([status])
-        expect(status.unsubscribed?).to be(true)
       end
     end
   end