Remove backoff mechanisms for now.

4 jobs from parallel_for in 3 minutes 50 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #3067
build_cmake

00:44

 
  Test
passed #3068
run_tests

00:44

 
  Sanitizer
passed #3070
run_address_sanitizer

01:21

passed #3069
run_thread_sanitizer

01:00