Optimize parallel distribution between live env tests

What does this MR do?

Related to: https://gitlab.com/gitlab-org/quality/team-tasks/-/issues/1227

Right now package tests take significantly more time to complete (50+minutes) and at the same time create tests complete way faster than other jobs (10 minutes per parallel job).

By making a more even parallel distribution, the overall qa stage runtime should be reduced from around 55minutes package jobs takes to finish to about 25.

Check-list

• Verify the change in all affected pipelines.