chore: define and parse default reviewers from team_members comment in CODEOWNERS

Author: shivanee-p

.github/CODEOWNERS

@@ -6,7 +6,8 @@
 
 
 # The cloud sdk nodejs team is the default owner for nodejs repositories.
-*     @pearigee @feywind @djbruce @shivanee-p
+# team_members: @pearigee @feywind @djbruce @shivanee-p
+*     @googleapis/cloud-sdk-nodejs-team
 /handwritten/bigquery @googleapis/bigquery-team
 /handwritten/cloud-profiler @googleapis/cloud-profiler-team
 /handwritten/storage @googleapis/gcs-team

.github/workflows/assign-reviewers.yml

@@ -112,19 +112,18 @@ jobs:
                 const content = Buffer.from(codeownersData.content, 'base64').toString('utf-8');
                 const lines = content.split('\n');
                 for (const line of lines) {
-                  const commentIdx = line.indexOf('#');
-                  const cleanLine = (commentIdx !== -1 ? line.substring(0, commentIdx) : line).trim();
-                  if (!cleanLine) continue;
-
-                  const parts = cleanLine.split(/\s+/);
-                  const pattern = parts[0];
-                  if (pattern === '*') {
-                    const owners = parts.slice(1);
-                    defaultReviewers = owners
-                      .filter(p => p.startsWith('@') && !p.includes('/'))
-                      .map(p => p.substring(1))
-                      .filter(login => login !== author);
-                    break;
+                  const trimmed = line.trim();
+                  if (trimmed.startsWith('#')) {
+                    const commentContent = trimmed.substring(1).trim();
+                    if (commentContent.startsWith('team_members:')) {
+                      const listPart = commentContent.substring('team_members:'.length).trim();
+                      const parts = listPart.split(/\s+/);
+                      defaultReviewers = parts
+                        .filter(p => p.startsWith('@'))
+                        .map(p => p.substring(1))
+                        .filter(login => login !== author);
+                      break;
+                    }
                   }
                 }
               } catch (err) {