feat: add AWS_PINPOINT_DEFAULT_POOL_ID variable to k8s and set in staging

[sastels]

What happens when your PR merges?

- `feat:` - tag `main` as a new minor release

What are you changing?

• Releasing a new version of Notify
• Changing kubernetes configuration

Provide some background on the changes

Following cds-snc/notification-api#2173, we add the new AWS_PINPOINT_DEFAULT_POOL_ID variable to k8s.

$ make diff-staging
> AWS_PINPOINT_DEFAULT_POOL_ID=pool-8885654b47d6466f9aaee14c62494ff2

$ make diff-production
> AWS_PINPOINT_DEFAULT_POOL_ID=

Note that in production (where AWS_PINPOINT_SC_POOL_ID and AWS_PINPOINT_DEFAULT_POOL_ID are not set) we will still fall back to SNS.

Checklist if making changes to Kubernetes:

• I know how to get kubectl credentials in case it catches on fire

[github-actions]

github-arc-ss-staging	github-arc-controller	5       	2024-05-22 16:02:46.611204082 +0000 UTC	deployed	gha-runner-scale-set-0.8.2	0.8.2      

ingress	nginx    	2       	2024-02-12 19:08:42.93215444 +0000 UTC	deployed	nginx-ingress-1.1.2	3.4.2      

Comparing release=karpenter-crd, chart=/tmp/helmfile1668290868/karpenter/staging/karpenter-crd/karpenter-crd/0.36.1/karpenter-crd
Comparing release=karpenter, chart=/tmp/helmfile1668290868/karpenter/staging/karpenter/karpenter/0.36.1/karpenter
Comparing release=karpenter-nodepool, chart=charts/karpenter-nodepool
Comparing release=priority-classes, chart=deliveryhero/priority-class
Comparing release=secrets-store-csi-driver, chart=secrets-store-csi-driver/secrets-store-csi-driver
Comparing release=aws-secrets-provider, chart=aws-secrets-manager/secrets-store-csi-driver-provider-aws
Comparing release=github-arc, chart=charts/gha-runner-scale-set-controller
Comparing release=github-arc-ss-staging, chart=/tmp/helmfile1668290868/github-arc-controller/staging/github-arc-ss-staging/gha-runner-scale-set/0.8.2/gha-runner-scale-set
Comparing release=blazer, chart=stakater/application
Comparing release=ingress, chart=charts/nginx-ingress

[jzbahrai]

Tested!

Archive:  .previous.env.zip
  inflating: .env
Archive:  .env.zip
  inflating: .env
114a115
> AWS_PINPOINT_DEFAULT_POOL_ID=pool-8885654b47d6466f9aaee14c62494ff2

➜  notification-manifests git:(add-AWS_PINPOINT_DEFAULT_POOL_ID-variable) make diff-production
Archive:  .previous.env.zip
  inflating: .env
Archive:  .env.zip
  inflating: .env
113a114
> AWS_PINPOINT_DEFAULT_POOL_ID=