chore(ci): remove leftover logic from on_merged_pr workflow

Author: heitorlessa

.github/scripts/label_related_issue.js

@@ -40,7 +40,7 @@ module.exports = async ({github, context, core}) => {
 
     try {
       core.info(`Auto-labeling related issue ${issue} for release`)
-      await github.rest.issues.addLabels({
+      return await github.rest.issues.addLabels({
         issue_number: issue,
         owner: context.repo.owner,
         repo: context.repo.repo,
@@ -50,14 +50,4 @@ module.exports = async ({github, context, core}) => {
       core.setFailed(`Is this issue number (${issue}) valid? Perhaps a discussion?`);
       throw new Error(error);
     }
-
-    const { groups: {relatedIssueNumber} } = isMatch
-
-    core.info(`Auto-labeling related issue ${relatedIssueNumber} for release`)
-    return await github.rest.issues.addLabels({
-      issue_number: relatedIssueNumber,
-      owner: context.repo.owner,
-      repo: context.repo.repo,
-      labels: [relatedIssueNumber]
-    })
 }