fix: replace non-existent labels with valid repository labels

Replaces 'aws-provider-update', 'auto-discovered', and 'needs-triage'
with 'aws-backup', 'features', and 'terraform' to prevent label
validation errors during automated issue creation.

Author: lgallard

.github/workflows/feature-discovery.yml

@@ -458,7 +458,7 @@ jobs:
 
           ---
           *Auto-generated by AWS Backup Feature Discovery Bot*" \
-                  --label "enhancement,aws-provider-update,auto-discovered,needs-triage" \
+                  --label "enhancement,aws-backup,features,terraform" \
                   --assignee "lgallard")
                 
                 # Extract issue number from URL
@@ -581,7 +581,7 @@ jobs:
               ISSUE_URL=$(gh issue create \
                 --title "$ISSUE_TITLE" \
                 --body "$ISSUE_BODY" \
-                --label "enhancement,aws-provider-update,auto-discovered,needs-triage" \
+                --label "enhancement,aws-backup,features,terraform" \
                 --assignee "lgallard")
               
               # Extract issue number