Remove DBSecurityGroup CRD from rds-controller (#80)

Issue #, if available: [issue-1290](aws-controllers-k8s/community#1290)

Description of changes:

Since now all new RDS db instances are VPC instances, there is no need to still leave CRD DBSecurityGroup open. Now RDS db instances are using VPC security group. 
(According to https://docs.aws.amazon.com/AmazonRDS/latest/APIReference/API_CreateDBSecurityGroup.html )

Remove DBSecurityGroup CRD from rds-controller. Also remove the db_security_group e2e test. 

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

Author: brucegucode

apis/v1alpha1/ack-generate-metadata.yaml

@@ -1,13 +1,13 @@
 ack_generate_info:
-  build_date: "2022-05-27T18:41:36Z"
+  build_date: "2022-06-02T18:10:06Z"
   build_hash: 6acf40fe3e3cfd97b799ef7cbf1e89e01c3db8f7
   go_version: go1.18.2
   version: v0.18.4-15-g6acf40f
-api_directory_checksum: 68d22d197b3187ea9f81567aca22f0a95ceaf00a
+api_directory_checksum: f8a740e73423e911df6a1b5fbcb9fbbb03cd9899
 api_version: v1alpha1
 aws_sdk_go_version: v1.42.0
 generator_config_info:
-  file_checksum: 89eb9928dcfbe0af48b80281c4fbe934cd7ddb23
+  file_checksum: c9f1d6ca4596ac8e84312495f50a8b901843744f
   original_file_name: generator.yaml
 last_modification:
   reason: API generation

apis/v1alpha1/db_instance.go

@@ -11,13 +11,15 @@ ignore:
     #- DBParameterGroup
     - DBProxy
     - DBProxyEndpoint
-    #- DBSecurityGroup
+    - DBSecurityGroup
     - DBSnapshot
     #- DBSubnetGroup
     - EventSubscription
     #- GlobalCluster
     - OptionGroup
   field_paths:
+    - CreateDBInstanceInput.DBSecurityGroups
+    - DBInstance.DBSecurityGroups
 operations:
   ModifyDBCluster:
     override_values:
@@ -154,7 +156,6 @@ resources:
         - InvalidParameter
         - InvalidParameterValue
         - InvalidParameterCombination
-        - DBSecurityGroupNotFound
         - DBSubnetGroupNotFoundFault
         - DBParameterGroupNotFound
     fields:
@@ -163,19 +164,6 @@ resources:
         is_immutable: true
       DBInstanceIdentifier:
         is_primary_key: true
-      # Because the Create input and Create/Update/ReadOne output shapes for
-      # the DBSecurityGroups field have different Go types, we are instructing
-      # the code generator to set the Spec.DBSecurityGroups field (which is a
-      # []string field) to the set of DBSecurityGroups..DBSecurityGroupName
-      # values in the ReadOne method's Output shape.
-      DBSecurityGroups:
-        set:
-          - method: Update
-            from: DBSecurityGroupName
-          - method: Create
-            from: DBSecurityGroupName
-          - method: ReadOne
-            from: DBSecurityGroupName
       MasterUserPassword:
         is_secret: true
       KmsKeyId:
@@ -237,22 +225,6 @@ resources:
         from:
           operation: ModifyDBParameterGroup
           path: Parameters
-  DBSecurityGroup:
-    renames:
-      operations:
-        DescribeDBSecurityGroups:
-          input_fields:
-            DBSecurityGroupName: Name
-        CreateDBSecurityGroup:
-          input_fields:
-            DBSecurityGroupName: Name
-            DBSecurityGroupDescription: Description
-        DeleteDBSecurityGroup:
-          input_fields:
-            DBSecurityGroupName: Name
-    fields:
-      Name:
-        is_primary_key: true
   DBSubnetGroup:
     renames:
       operations: