Chatops command: Trigger Zoekt reindexing for a whole namespace

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Sometimes we need to force reindex a whole namespace in Zoekt when we roll out an indexer change due to a bug. In order to save us having to create a change request each time and get rails console access we should have a chatops command.

There is already an API for reindexing a project but it's too cumbersome to iterate thousands of projects so we should add another API for a whole root namespace.