Added ff and flow to skip Namespace Aggregation Lease

Suraj Tripathirequested to merge
issue_370251_remove_namespace_agg_scheduler_lease into master

What does this MR do and why?

Removes dependency on Namespace::AggregationSchedule table for scheduling Namespaces::RootStatisticsWorker. Instead of creating a new AggregationSchedule Record and procuring a lease on it to avoid duplicate RootStatisticsWorker jobs, we want to check if the deduplication logic is enough to handle that.

Have added the new proposed flow behind a FF to ensure this change does not impact other Sidekiq jobs resulting in other jobs getting delayed.

ref: https://gitlab.com/gitlab-org/gitlab/-/issues/370251

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Edited by Suraj Tripathi

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