Add snippet deletion to test cleanup pipeline
What does this MR do?
Adds snippet deletion to general test resource cleanup scheduled pipeline.
Part of gitlab-org/quality/quality-engineering/team-tasks#2539 (closed) and https://gitlab.com/gitlab-com/gitlab-OKRs/-/work_items/6490
Should only be merged after gitlab-org/gitlab!149331 (merged)
Check-list
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Ensure commits include Changelog:
trailer -
Verify the change in all affected pipelines.
Edited by Désirée Chevalier