[lldb] Add llgs_test decorator back to TestAutoInstallMainExecutable

This got removed in 68bb51acd572735d80d20adb2c2fc51a5cbbd88e and this enabled
the test on macOS (where it just causes lldb-server to crash). Re-adding the
decorator to get the tests passing again.

GitOrigin-RevId: c68a645acb833109f4bb0d859686b05a81b2be7d
diff --git a/test/API/commands/target/auto-install-main-executable/TestAutoInstallMainExecutable.py b/test/API/commands/target/auto-install-main-executable/TestAutoInstallMainExecutable.py
index 92151ce..862943c 100644
--- a/test/API/commands/target/auto-install-main-executable/TestAutoInstallMainExecutable.py
+++ b/test/API/commands/target/auto-install-main-executable/TestAutoInstallMainExecutable.py
@@ -15,6 +15,7 @@
     mydir = TestBase.compute_mydir(__file__)
     NO_DEBUG_INFO_TESTCASE = True
 
+    @llgs_test
     @skipIfRemote
     @expectedFailureAll(oslist=["windows"]) # process modules not loaded
     def test_target_auto_install_main_executable(self):