Simplify static-analysis output generation

The buffering of the output may be causing issues, so let's disable it
for now.

scripts/static-analysis

@@ -4,27 +4,6 @@
 require_relative '../lib/gitlab/popen'
 require_relative '../lib/gitlab/popen/runner'
-def emit_warnings(static_analysis)
-  static_analysis.warned_results.each do |result|
-    puts
-    puts "**** #{result.cmd.join(' ')} had the following warning(s):"
-    puts
-    puts result.stderr
-    puts
-  end
-end
-
-def emit_errors(static_analysis)
-  static_analysis.failed_results.each do |result|
-    puts
-    puts "**** #{result.cmd.join(' ')} failed with the following error(s):"
-    puts
-    puts result.stdout
-    puts result.stderr
-    puts
-  end
-end
-
 tasks = [
   %w[bin/rake lint:all],
   %w[bundle exec license_finder],
@@ -36,37 +15,13 @@ tasks = [
   %w[scripts/lint-rugged]
 ]
-static_analysis = Gitlab::Popen::Runner.new
-
-static_analysis.run(tasks) do |cmd, &run|
-  puts
-  puts "$ #{cmd.join(' ')}"
-
-  result = run.call
-  puts "==> Finished in #{result.duration} seconds"
-  puts
-end
-
-puts
-puts '==================================================='
-puts
-puts
-
-if static_analysis.all_success_and_clean?
-  puts 'All static analyses passed successfully.'
-elsif static_analysis.all_success?
-  puts 'All static analyses passed successfully, but we have warnings:'
-  puts
-
-  emit_warnings(static_analysis)
-
-  exit 2
-else
-  puts 'Some static analyses failed:'
-
-  emit_warnings(static_analysis)
-  emit_errors(static_analysis)
-
-  exit 1
+tasks.each do |task|
+  cmd = task.join(' ')
+  puts "$ #{cmd}"
+  result = system(cmd)
+  unless result
+    puts "#{cmd} failed!"
+    exit 1
+  end
 end