Zoekt: Create chatops command for managing replicas
## Background This is an issue to allow us to specify the number of replicas on production without requiring a C2 CR. ## Proposal Now, we should introduce a new chatops command / internal API to allow us changing the number of replicas on production (override). This is to enable this feature for `gitlab-org` before we assess storage impact and ready roll it out further. I think that we should add: ``` /chatops run zoekt enabled_namespace set_replicas <root_namespace_id/group_path> <number_of_replicas/nil> ``` That would update `zoekt_enabled_namespace.replicas` override ## Context - Examples: - Admin API MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/116650 - Chatops MR: https://gitlab.com/gitlab-com/chatops/-/merge_requests/368 <!-- Use this section to explain the feature and how it will work. It can be helpful to add technical details, design proposals, and links to related epics or issues. --> <!-- Please add a label for the type of maintenance as per https://handbook.gitlab.com/handbook/product/groups/product-analysis/engineering/metrics/#work-type-classification -->
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