feat(dev-infra): commit message validation should skip lines consisting of URLs (#37890)

The dev-infra commit message validation optionally can check for lines
to not exceed a given amount of characters. This is desired for most
commit messages, but sometimes not actionable if a long URL is inserted
into the commit message. With this commit, we skip the max line length
check for lines that start with an URL.

PR Close #37890

dev-infra/commit-message/validate.spec.ts

@@ -77,6 +77,15 @@ describe('validate-commit-message.js', () => {
           config.commitMessage.maxLineLength} characters`);
     });
 
+    it('should skip max length limit for URLs', () => {
+      const msg = 'fix(compiler): this is just an usual commit message tile\n\n' +
+          'This is a normal commit message body which does not exceed the max length\n' +
+          'limit. For more details see the following super long URL:\n\n' +
+          'https://github.com/angular/components/commit/e2ace018ddfad10608e0e32932c43dcfef4095d7#diff-9879d6db96fd29134fc802214163b95a';
+
+      expect(validateCommitMessage(msg)).toBe(VALID);
+    });
+
     it('should validate "<type>(<scope>): <subject>" format', () => {
       const msg = 'not correct format';