Revert removal of ExclusiveLease from Users::ActivityService
What does this MR do and why?
This is a combined revert of !151342 (merged) and !152168 (merged)
We are reverting these because the removal of ExclusiveLease
from this area is causing an increase in SQL queries at 00:00 UTC, which is the start of the day, and the time when we update last_activity_on for a user by updating their attribute.
It seems like the first few requests of a day for each user can be highly concurrent in nature, and leading to issue such as this: gitlab-com/gl-infra/production#18020 (comment 1908088688).
So, it is appropriate to revert this change for now and then think about other solutions.
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