Continue removal of Trial Abandonment worker
What does this MR do and why?
Continue removal of Trial Abandonment worker
- as per https://docs.gitlab.com/ee/development/sidekiq/compatibility_across_updates.html#in-a-subsequent-separate-minor-release
- use was removed in 17.0 in !149709 (merged)
- see https://gitlab.com/gitlab-org/gitlab/-/issues/454538
Changelog: other EE: true
MR acceptance checklist
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Related to #454538