Disable test stats. (#231)

This is temporary in order to resolve build failures when the
publish-over-ssh plugin fails to properly authenticate after the change
in docs host keys.

noetic/source-build.yaml

@@ -3,7 +3,7 @@
 ---
 build_environment_variables:
   ROS_PYTHON_VERSION: 3
-collate_test_stats: true
+collate_test_stats: false
 jenkins_commit_job_priority: 54
 jenkins_job_timeout: 120
 jenkins_pull_request_job_priority: 44