chore(shorebird_cli): don't print error toString on command failure (#2284)

packages/shorebird_cli/lib/src/shorebird_cli_command_runner.dart

@@ -203,7 +203,7 @@ Engine • revision ${shorebirdEnv.shorebirdEngineRevision}''');
         exitCode = error.exitCode;
       } catch (error, stackTrace) {
         logger
-          ..err('$error')
+          ..detail('$error')
           ..detail('$stackTrace');
         exitCode = ExitCode.software.code;
       }

packages/shorebird_cli/test/src/shorebird_cli_command_runner_test.dart

@@ -260,15 +260,16 @@ Engine • revision $shorebirdEngineRevision''',
     });
 
     group('on command failure', () {
-      test('logs a stack trace using detail', () async {
-        // This will fail due to the release android command missing scoped
-        // dependencies.
+      test('logs error and stack trace using detail', () async {
+        // This will fail with a StateError due to the release android command
+        // missing scoped dependencies.
         // Note: the --verbose flag is here for illustrative purposes only.
         // Because logger is a mock, setting the log level in code does
         // nothing.
         await runWithOverrides(
           () => commandRunner.run(['release', 'android', '--verbose']),
         );
+        verify(() => logger.detail(any(that: contains('Bad state')))).called(1);
         verify(() => logger.detail(any(that: contains('#0')))).called(1);
       });