Updated event trigger from pull_request to pull_request_target

Also added if the details is missing then the validation will fail from a custom validation error

.github/workflows/pr-body-validation.yml

@@ -1,7 +1,7 @@
 name: PR Body Validation
 
 on:
-  pull_request:
+  pull_request_target:
     types: [opened, edited, synchronize, reopened]
 
 jobs:
@@ -104,6 +104,7 @@ jobs:
                   labels: ['needs-info']
                 });
               }
+              core.setFailed(`The following required information is missing or incomplete: ${missingItemsList}`);
             } else if (hasNeedsInfoLabel) {
               // If all requirements are met and the needs-info label exists, remove it
               await github.rest.issues.removeLabel({
@@ -112,4 +113,4 @@ jobs:
                 issue_number: context.issue.number,
                 name: 'needs-info'
               });
-            }
+            }