feat (operator): add support for IRSA (aws resources access) (#3128)

* fix data to POSIX and sed working on macos
* add ServiceAccountGetter to the newFakeK8sAnnotationsClient for unit tests
* try to update the service account
* use irsa_role_arn since we need the full arn, and remove enable_irsa
* move sa sync code to existing sync.go file to be all together
* change all Irsa to IRSA to follow go idiomatic that capitalize initialisms or acronyms
* using Update instead of Patch for the service account syn
* document the new option and add the key in the values/configs
* add the new option to the administrator docs
* trying to increase the timeout for the flaky test after sync

---------

Co-authored-by: Felix Kunde <felix-kunde@gmx.de>

charts/postgres-operator/crds/operatorconfigurations.yaml

@@ -73,6 +73,8 @@ spec:
                     type: integer
                   gcp_credentials:
                     type: string
+                  irsa_role_arn:
+                    type: string
                   kube_iam_role:
                     type: string
                   log_s3_bucket:

charts/postgres-operator/values.yaml

@@ -360,6 +360,8 @@ configAwsOrGcp:
 
   # AWS IAM role to supply in the iam.amazonaws.com/role annotation of Postgres pods
   # kube_iam_role: ""
+  # Full ARN for IRSA (IAM Roles for Service Accounts) on EKS
+  # irsa_role_arn: ""
 
   # S3 bucket to use for shipping postgres daily logs
   # log_s3_bucket: ""