Update master(Ussuri) jobs and stable branch jobs

* Remove all python3 jobs for previous stable branches.

Depends-On: https://review.opendev.org/700830
Depends-On: https://review.opendev.org/700854
Depends-On: https://review.opendev.org/700855
Depends-On: https://review.opendev.org/700857

Depends-On: https://review.opendev.org/701345

Story: #2007061
Task: #37922
Task: #37923

Task: #37901

Change-Id: I15ea84d4c1c32fa689dd3bed61ff26086da5f595
1 file changed