Backport of NET-4967: Fix helm install when setting copyAnnotations or nodeSelector for apiGateway into release/1.2.x

[hc-github-team-consul-core]

Backport

This PR is auto-generated from #2597 to be assessed for backporting due to the inclusion of the label backport/1.2.x.

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

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Changes proposed in this PR:
Modify Helm chart to properly support passing multiline strings for api-gateway nodeSelector and copyAnnotations

How I've tested this PR:
helm install with a values.yaml containing multiline values for the impacted args. The Job modified in this PR should correctly install and run as a post-install hook. You should also see the copyAnnotations and nodeSelector value make it onto the GatewayClassConfig in their entirety.

global:
  name: consul

  tls:
    enabled: true

connectInject:
  apiGateway:
    managedGatewayClass:
      nodeSelector: |
        kubernetes.io/os: linux
        kubernetes.io/is: windows
      copyAnnotations:
        service:
          annotations: |
            - service.beta.kubernetes.io/aws-load-balancer-scheme
            - service.beta.kubernetes.io/aws-load-balancer-name

➜  consul git:(multiline-args) helm upgrade --install consul ~/workspaces/consul-k8s/charts/consul --values ~/workspaces/lab/node-selector/values.yaml
Release "consul" has been upgraded. Happy Helming!
...

➜  consul git:(multiline-args) kubectl get gatewayclassconfig consul-api-gateway -o yaml
apiVersion: consul.hashicorp.com/v1alpha1
kind: GatewayClassConfig
...
spec:
  copyAnnotations:
    service:
    - service.beta.kubernetes.io/aws-load-balancer-scheme
    - service.beta.kubernetes.io/aws-load-balancer-name
  deployment:
    defaultInstances: 1
    maxInstances: 1
    minInstances: 1
  nodeSelector:
    kubernetes.io/is: windows
    kubernetes.io/os: linux
  serviceType: LoadBalancer

How I expect reviewers to test this PR:
See above

Checklist:

• Tests added
• CHANGELOG entry added

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Overview of commits

• 233b0d1 - c2f4378 - c38dd3f - 7df5f84