Add basic random stealing.

4 jobs from random_stealing in 3 minutes 34 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #2826
build_cmake

00:39

 
  Test
passed #2827
run_tests

00:39

 
  Sanitizer
passed #2829
run_address_sanitizer

01:16

passed #2828
run_thread_sanitizer

00:59