Backport of GKE Autopilot support into release/1.2.x

[hc-github-team-consul-core]

Backport

This PR is auto-generated from #2952 to be assessed for backporting due to the inclusion of the label backport/1.2.x.

🚨

Warning automatic cherry-pick of commits failed. If the first commit failed,
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the merge conflict occurred.

The person who merged in the original PR is:
@curtbushko
This person should manually cherry-pick the original PR into a new backport PR,
and close this one when the manual backport PR is merged in.

merge conflict error: POST https://api.github.com/repos/hashicorp/consul-k8s/merges: 409 Merge conflict []

The below text is copied from the body of the original PR.

---

Changes proposed in this PR:

• This adds a first pass of support for running on GKE Autopilot.
• We won't know how things fully work until we are certified with 1.2.2 (next patch release)
• I tried to do this without any helm chart values changes but it would have been considerably more messy than it is now.

How I've tested this PR:

• went through an initial acceptance pass with the Autopilot team
• installed consul-k8s using the following helm values:

global:
  name: consul
  datacenter: dc1
  logLevel: "debug"
  tls:
    enabled: false
ingress:
  enabled: false
server:
  replicas: 1
  resources:
    requests:
      memory: "200Mi"
      cpu: "500m"
    limits:
      memory: "200Mi"
      cpu: "500m"
connectInject:
  enabled: true
  default: true
  replicas: 1
  transparentProxy:
    defaultEnabled: true
  apiGateway:
    manageExternalCRDs: false
    manageCustomCRDs: true
dns:
  enabled: false
ui:
  enabled: true
  service:
    enabled: true
controller:
  enabled: true

How I expect reviewers to test this PR:

Checklist:

• Tests added
• CHANGELOG entry added

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Overview of commits

• f3231ce - 44a50d4 - 8455da4 - 5936014 - d7e3a11 - 805f934

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[missylbytes]

I accidentally generated these by adding the backport label to the incorrect branch. #4213