CCM-12323: Adding S3 restore testing plan

Author: sidnhs

infrastructure/modules/aws-backup-source/backup_restore_testing_selection_comms_backup_restore_selection_s3.tf

@@ -0,0 +1,18 @@
+resource "aws_backup_restore_testing_selection" "backup_restore_testing_selection_s3" {
+  count = var.backup_plan_config_s3.enable ? 1 : 0
+  name                      = "${local.csi_underscore}_s3_backup_restore"
+  restore_testing_plan_name = "${local.csi_underscore}_restore_testing_plan"
+  protected_resource_type   = "S3"
+  iam_role_arn              = aws_iam_role.backup.arn
+  protected_resource_conditions {
+    string_equals {
+      key   = "aws:ResourceTag/${var.backup_plan_config_s3.selection_tag}"
+      value = "True"
+    }
+  }
+
+  restore_metadata_overrides = {
+    EncryptionType = "SSE_KMS"
+    KmsKey         = aws_kms_alias.backup_key.arn
+  }
+}