ci: only lint commit messages in the PR (#35035)

PR Close #35035

tools/utils/get-refs-and-shas-for-target.js

@@ -6,6 +6,9 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
+// This script uses `console` to print messages to the user.
+// tslint:disable:no-console
+
 const https = require('https');
 const util = require('util');
 const child_process = require('child_process');
@@ -68,18 +71,19 @@ module.exports = async function getRefsAndShasForTarget(prNumber) {
   const {stdout: commonAncestorSha} =
       await exec(`git merge-base origin/${result.base.ref} ${latestShaOfPrBranch}`);
 
-  return {
+  const output = {
     base: {
-      ref: result.base.ref.trim(),
-      sha: result.base.sha.trim(),
+      ref: result.base.ref,
+      sha: result.base.sha,
     },
     head: {
-      ref: result.head.ref.trim(),
-      sha: result.head.sha.trim()
+      ref: result.head.ref,
+      sha: result.head.sha,
     },
     commonAncestorSha: commonAncestorSha.trim(),
     latestShaOfTargetBranch: latestShaOfTargetBranch.trim(),
     latestShaOfPrBranch: latestShaOfPrBranch.trim(),
-  }
+  };
 
-}
+  return output;
+};