chore(crossplane): split providerconfigs and use a chain of AssumeRoles

bootstrap/crossplane/providerconfig.yaml

@@ -1,18 +0,0 @@
-apiVersion: aws.upbound.io/v1beta1
-kind: ProviderConfig
-metadata:
-  name: default
-  annotations:
-    argocd.argoproj.io/hook: PostSync
-    argocd.argoproj.io/sync-options: SkipDryRunOnMissingResource=true
-spec:
-  credentials:
-    source: Secret
-    secretRef:
-      namespace: crossplane-system
-      name: aws-secret
-      key: creds
-
-  assumeRole:
-    roleARN: "arn:aws:iam::000654387266:role/crossplane"
-