Remove repo-updater container (#4468)

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

- [ ]
[CHANGELOG.md](https://github.com/sourcegraph/sourcegraph/blob/main/CHANGELOG.md)
updated
- [x] [K8s Upgrade notes
updated](https://github.com/sourcegraph/sourcegraph/blob/main/doc/admin/updates/kubernetes.md)
- [x] Sister
[deploy-sourcegraph-k8s](https://github.com/sourcegraph/deploy-sourcegraph-docker)
change: sourcegraph/deploy-sourcegraph-k8s#269
- [x] Sister
[deploy-sourcegraph-docker](https://github.com/sourcegraph/deploy-sourcegraph-docker)
change:
sourcegraph/deploy-sourcegraph-docker#1202
- [ ] All images have a valid tag and SHA256 sum
- [x] I acknowledge that
[deploy-sourcegraph-k8s](https://github.com/sourcegraph/deploy-sourcegraph-k8s)
is now the preferred Kubernetes deployment repository

Author: eseliger

README.dev.md

@@ -121,9 +121,9 @@ Additionally you may want to deploy a modified version of a service locally. Min
 
 ```shell
 eval $(minikube docker-env)
-IMAGE=repo-updater:dev ./cmd/repo-updater/build.sh
-kubectl edit deployment/repo-updater # set imagePullPolicy to Never
-kubectl set image deployment repo-updater '*=repo-updater:dev'
+IMAGE=frontend:dev ./cmd/frontend/build.sh
+kubectl edit deployment/frontend # set imagePullPolicy to Never
+kubectl set image deployment frontend '*=frontend:dev'
 ```
 
 You can also use the [minikube overlay](overlays/minikube/README.md). This avoids modifying the config files in `base`.

base/repo-updater/repo-updater.Deployment.yaml

@@ -31,8 +31,6 @@ resources:
 - base/prometheus/prometheus.ConfigMap.yaml
 - base/prometheus/prometheus.Deployment.yaml
 - base/prometheus/prometheus.Service.yaml
-- base/repo-updater/repo-updater.Service.yaml
-- base/repo-updater/repo-updater.Deployment.yaml
 - base/worker/worker.Deployment.yaml
 - base/worker/worker.Service.yaml
 - base/worker/worker-executors.Service.yaml

base/repo-updater/repo-updater.Service.yaml

@@ -68,12 +68,6 @@ patches:
     group: apps
     version: v1
   path: delete-resources-2.yaml
-- target:
-    kind: Deployment
-    name: repo-updater
-    group: apps
-    version: v1
-  path: delete-resources.yaml
 - target:
     kind: Deployment
     name: searcher
@@ -424,22 +418,6 @@ patches:
   target:
     kind: Deployment
     name: precise-code-intel-worker
-- patch: |-
-    apiVersion: apps/v1
-    kind: Deployment
-    metadata:
-      name: unused
-    spec:
-      template:
-        spec:
-          containers:
-            - name: repo-updater
-              env:
-              - name: NEW_MIGRATIONS
-                value: "true"
-  target:
-    kind: Deployment
-    name: repo-updater
 
 patchesStrategicMerge:
 - cadvisor/delete-Daemonset.yaml

overlays/bases/deployments/kustomization.yaml

@@ -68,12 +68,6 @@ patches:
       group: apps
       version: v1
     path: delete-resources-2.yaml
-  - target:
-      kind: Deployment
-      name: repo-updater
-      group: apps
-      version: v1
-    path: delete-resources.yaml
   - target:
       kind: Deployment
       name: searcher

overlays/low-resource/kustomization.yaml

@@ -21,7 +21,6 @@ patchesStrategicMerge:
   - redis/redis-cache.Deployment.yaml
   - redis/redis-store.Deployment.yaml
   - worker/worker.Deployment.yaml
-  - repo-updater/repo-updater.Deployment.yaml
   - searcher/searcher.Deployment.yaml
   - symbols/symbols.Deployment.yaml
   - syntect-server/syntect-server.Deployment.yaml

overlays/minikube/kustomization.yaml

@@ -307,24 +307,6 @@ metadata:
 ---
 apiVersion: apps/v1
 kind: Deployment
-metadata:
-  name: repo-updater
-# spec:
-#   replicas: 1 # IMPORTANT: Singleton service. Do NOT add more replica.
-#   template:
-#     spec:
-#       containers:
-#       - name: repo-updater
-#         resources:
-#           limits:
-#             cpu: "1"
-#             memory: 2Gi
-#           requests:
-#             cpu: "1"
-#             memory: 500Mi
----
-apiVersion: apps/v1
-kind: Deployment
 metadata:
   name: searcher
 # spec: