fix(git-node): properly terminate pr landing sessions (#708)

Fixes: #707

Author: anonrig

lib/landing_session.js

@@ -62,8 +62,8 @@ export default class LandingSession extends Session {
     const shouldContinue = await cli.prompt(
       `This PR ${status} to land, do you want to continue?`, { defaultAnswer });
     if (!shouldContinue) {
-      cli.setExitCode(1);
-      return this.abort(false);
+      await this.abort(false);
+      return process.exit(1);
     }
 
     this.saveMetadata(metadata);