fix(catalog-backend): fix codeowners processor to handle users

.changeset/great-apples-flash.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-catalog-backend': patch
+---
+
+Fix CodeOwnersProcessor to handle non team users

plugins/catalog-backend/src/ingestion/processors/CodeOwnersProcessor.test.ts

@@ -123,6 +123,10 @@ describe('CodeOwnersProcessor', () => {
   });
 
   describe('normalizeCodeOwner', () => {
+    it('should remove the @ symbol', () => {
+      expect(normalizeCodeOwner('@yoda')).toBe('yoda');
+    });
+
     it('should remove org from org/team format', () => {
       expect(normalizeCodeOwner('@acme/foo')).toBe('foo');
     });

plugins/catalog-backend/src/ingestion/processors/CodeOwnersProcessor.ts

@@ -127,6 +127,8 @@ export function findPrimaryCodeOwner(
 export function normalizeCodeOwner(owner: string) {
   if (owner.match(/^@.*\/.*/)) {
     return owner.split('/')[1];
+  } else if (owner.match(/^@.*/)) {
+    return owner.substring(1);
   } else if (owner.match(/^.*@.*\..*$/)) {
     return owner.split('@')[0];
   }