update: set default deployType to Kustomize

[abeatrix]

Description

set default deployType to Kustomize

Include minor components touch up

---

Checklist

• Update CHANGELOG.md
• Update K8s Upgrade notes
• Update sister repository: deploy-sourcegraph-helm
• Update sister repository: deploy-sourcegraph-docker
• Verify all images have a valid tag and SHA256 sum
• Kustomiz-specific

Test plan

Tested deployment with changes included in this PR:

❯ k get pods -A
NAMESPACE     NAME                                             READY   STATUS    RESTARTS      AGE
default       blobstore-554b48dfb8-74hfg                       1/1     Running   0             19m
default       codeinsights-db-0                                2/2     Running   0             19m
default       codeintel-db-0                                   2/2     Running   1 (16m ago)   19m
default       github-proxy-699bdf7d88-2qqpc                    1/1     Running   0             19m
default       gitserver-0                                      1/1     Running   0             5m17s
default       grafana-0                                        1/1     Running   0             19m
default       indexed-search-0                                 2/2     Running   0             19m
default       node-exporter-7qd6z                              1/1     Running   0             41m
default       node-exporter-sbv97                              1/1     Running   0             41m
default       node-exporter-z9wmp                              1/1     Running   0             41m
default       pgsql-0                                          2/2     Running   0             19m
default       precise-code-intel-worker-5d7987f59-q622r        1/1     Running   0             19m
default       prometheus-69fc6fcc65-r2ksq                      1/1     Running   0             19m
default       redis-cache-64d97fcdd9-szp5b                     2/2     Running   0             19m
default       redis-store-f695c85cf-rhflf                      2/2     Running   0             19m
default       repo-updater-5464d58c7c-q7k5d                    1/1     Running   0             19m
default       searcher-0                                       1/1     Running   0             19m
default       sourcegraph-frontend-567cf7bfd-p5ldc             1/1     Running   0             19m
default       symbols-0                                        1/1     Running   0             19m
default       syntect-server-694b8f9fdc-g94mj                  1/1     Running   0             19m
default       worker-69b67b7b8c-lltgr                          1/1     Running   0             19m

[jdpleiness]

This is great!