Add e2e-sandbox-groups to scheduled cleanup

What does this MR do?

Adds gitlab-e2e-sandbox-group-ns to scheduled cleanup pipelines while we transition to them from gitlab-qa-sandbox-group-ns. These new e2e groups have not been created yet but once they are functioning, gitlab-qa-sandbox-group-ns groups will be removed. This temporary coexistence is to ensure no test resources pile up during the switchover.

Also renames cleanup scripts from qa to e2e. (Except qa user PAT cleanup which needs further changes outside the scope of this MR)

Part of moving from qa to e2e: gitlab-org/quality/quality-engineering/team-tasks#3452

Check-list

• Ensure commits include Changelog: trailer
• Verify the change in all affected pipelines.