Remove assigning and adding reviewer to merge-back PR (#3249)

Author: cprecioso

.github/workflows/automation-merge-release-to-main.yaml

@@ -37,10 +37,6 @@ jobs:
           if [ -n "$existing_pr_number" ]; then
             gh pr comment "$existing_pr_number" \
               --body "Ping @${USERNAME}"
-
-            gh pr edit "$existing_pr_number" \
-              --add-assignee "$USERNAME" \
-              --add-reviewer "$USERNAME"
           else
             gh pr create \
               --assignee "$USERNAME" \