Cleanup updater specs output

Up to now, running updater specs prints a lot of server logs with a lot
of "E" letters that can be confused with spec failures, and it's hard to
process.

This commit adds some bare assertions on the output instead of printing
it, so that it's clean.

updater/spec/dependabot/file_fetcher_job_spec.rb

@@ -69,7 +69,7 @@
           )
         expect(api_client).to receive(:mark_job_as_processed)
 
-        perform_job
+        expect { perform_job }.to output(/Error during file fetching; aborting/).to_stdout_from_any_process
       end
     end
 
@@ -94,7 +94,7 @@
           )
         expect(api_client).to receive(:mark_job_as_processed)
 
-        perform_job
+        expect { perform_job }.to output(/Error during file fetching; aborting/).to_stdout_from_any_process
       end
     end
 
@@ -123,7 +123,7 @@
           )
         expect(api_client).to receive(:mark_job_as_processed)
 
-        perform_job
+        expect { perform_job }.to output(/Repository is rate limited, attempting to retry/).to_stdout_from_any_process
       end
     end
 
@@ -181,7 +181,7 @@
         end
         expect(api_client).to receive(:mark_job_as_processed)
 
-        perform_job
+        expect { perform_job }.to output(/Something went wrong/).to_stdout_from_any_process
 
         expect(Dir.exist?(Dependabot::Environment.repo_contents_path)).to be_truthy
         expect(Dir.empty?(Dependabot::Environment.repo_contents_path)).to be_truthy

updater/spec/dependabot/integration_spec.rb

@@ -175,18 +175,18 @@
         expect(api_client).to receive(:record_update_job_error).
           with(job_id, { error_type: "unknown_error", error_details: nil })
 
-        end_to_end_job.run
+        expect { end_to_end_job.run }.to output(/oh no!/).to_stdout_from_any_process
       end
 
       it "indicates there was an error in the summary" do
         expect(Dependabot.logger).not_to receive(:info).with(/Changes to Dependabot Pull Requests/)
         expect(Dependabot.logger).to receive(:info).with(/Dependabot encountered '1' error/)
 
-        end_to_end_job.run
+        expect { end_to_end_job.run }.to output(/oh no!/).to_stdout_from_any_process
       end
 
       it "does not raise an exception" do
-        expect { end_to_end_job.run }.not_to raise_error
+        expect { end_to_end_job.run }.to output(/oh no!/).to_stdout_from_any_process
       end
 
       context "when GITHUB_ACTIONS is set" do
@@ -195,7 +195,8 @@
         end
 
         it "raises an exception" do
-          expect { end_to_end_job.run }.to raise_error(Dependabot::RunFailure)
+          expect { end_to_end_job.run }.to raise_error(Dependabot::RunFailure).
+            and output(/oh no!/).to_stdout_from_any_process
         end
       end
     end