Remove repo-updater container #1202
                
     Merged
            
            
          
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Sister PR of sourcegraph/deploy-sourcegraph-helm#671.
Upgrade info alert is at sourcegraph/docs#1110.
The repo-updater service is no longer required starting with Sourcegraph 6.4.
Test plan: Repo-updater-less instances have been running for a while now.
Checklist