Remove sentry-raven gem
What does this MR do and why?
Follow-up from !2275 (merged), it removes the sentry-raven integration for the old sentry server.
Related to https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/23710 and gitlab-com/gl-infra/delivery#2867
Author Check-list
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Has documentation been updated?
Edited by Marius Bobin