DEV: Don't use delays for streaming summaries.

We started used a callback as a buffer in FoldContent, so the Fake endpoint is attempting
to emulate delays in the streaming. However, we don't care about that in these specs.

Author: romanrizzi

spec/jobs/scheduled/summaries_backfill_spec.rb

@@ -7,6 +7,9 @@
   let(:limit) { 24 } # guarantee two summaries per batch
   let(:intervals) { 12 } # budget is split into intervals. Job runs every five minutes.
 
+  before { DiscourseAi::Completions::Endpoints::Fake.delays = [] }
+  after { DiscourseAi::Completions::Endpoints::Fake.reset! }
+
   before do
     assign_fake_provider_to(:ai_summarization_model)
     SiteSetting.ai_summarization_enabled = true