fix: Fix duplicate error message

Author: Runrioter

src/cloud_auth.ts

@@ -32,7 +32,7 @@ export class CloudAuth implements Authenticator {
                         }
                         result = shelljs.exec(cmd);
                         if (result.code !== 0) {
-                            throw new Error(`Failed to refresh token: ${result.stderr}`);
+                            throw new Error(result.stderr);
                         }
                     } catch (err) {
                         throw new Error('Failed to refresh token: ' + err.message);

src/config_test.ts

@@ -596,7 +596,7 @@ describe('KubeConfig', () => {
                 } as User);
             const opts = {} as requestlib.Options;
             expect(() => config.applyToRequest(opts)).to.throw(
-                'Failed to refresh token: /bin/sh: 1: non-existent-command: not found');
+                'Failed to refresh token: /bin/sh: non-existent-command: command not found');
         });
 
         it('should exec with expired token', () => {