Promote ResourceAdoption and ReadOnlyResources features from Alpha to Beta status (#616)

Description of changes:
- Promote ResourceAdoption and ReadOnlyResources features from Alpha to Beta status

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Author: rushmash91

templates/helm/values.yaml.tpl

@@ -178,6 +178,6 @@ featureGates:
   # Enables the Team level granularity for CARM. See https://github.com/aws-controllers-k8s/community/issues/2031
   TeamLevelCARM: false
   # Enable ReadOnlyResources feature/annotation. 
-  ReadOnlyResources: false
+  ReadOnlyResources: true
   # Enable ResourceAdoption feature/annotation. 
-  ResourceAdoption: false
+  ResourceAdoption: true