Refactor BuildFinishedWorker for EE

This simply moves the logic from the "perform" method into a separate
"process_build" method, allowing EE to more easily extend this
behaviour.

app/workers/build_finished_worker.rb

@@ -9,14 +9,26 @@ class BuildFinishedWorker
   # rubocop: disable CodeReuse/ActiveRecord
   def perform(build_id)
     Ci::Build.find_by(id: build_id).try do |build|
-      # We execute that in sync as this access the files in order to access local file, and reduce IO
-      BuildTraceSectionsWorker.new.perform(build.id)
-      BuildCoverageWorker.new.perform(build.id)
-
-      # We execute that async as this are two independent operations that can be executed after TraceSections and Coverage
-      BuildHooksWorker.perform_async(build.id)
-      ArchiveTraceWorker.perform_async(build.id)
+      process_build(build)
     end
   end
   # rubocop: enable CodeReuse/ActiveRecord
+
+  private
+
+  # Processes a single CI build that has finished.
+  #
+  # This logic resides in a separate method so that EE can extend it more
+  # easily.
+  #
+  # @param [Ci::Build] build The build to process.
+  def process_build(build)
+    # We execute these in sync to reduce IO.
+    BuildTraceSectionsWorker.new.perform(build.id)
+    BuildCoverageWorker.new.perform(build.id)
+
+    # We execute these async as these are independent operations.
+    BuildHooksWorker.perform_async(build.id)
+    ArchiveTraceWorker.perform_async(build.id)
+  end
 end