Remove feature flag root_statistics_worker_read_replica
What does this MR do and why?
We introduced a feature flag here for Namespace::RootStatisticWorker idempotency uses a replica
Looking at the logs, https://log.gprd.gitlab.net/goto/4b25d010-641a-11ed-9f43-e3784d7fe3ca, the past 7 days, >99.9% of the jobs picked the happy path: choosing a replica and succeeding. I think that is sufficient to consider this successful and remove the feature flag.
This MR removed the Feature flag root_statistics_worker_read_replica entirely from the codebase.
Reference: https://gitlab.com/gitlab-org/gitlab/-/issues/379678#note_1170804183
MR acceptance checklist
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