Disable ament_xmllint

- I am disabling this for now it is failing in github actions not locally.
- Might be due to network issues in the containers ament/ament_lint#448

I will switch to a pre-commit hook for linting in a follow up PR.

Signed-off-by: Alex Moriarty <[email protected]>

robotiq_controllers/CMakeLists.txt

@@ -60,6 +60,10 @@ if(BUILD_TESTING)
   # ament_uncrustify and ament_clang_format cannot both be satisfied
   set(ament_cmake_uncrustify_FOUND TRUE)
 
+  # the following skips xmllint
+  # ament_xmllint requires network and can timeout if on throttled networks
+  set(ament_cmake_xmllint_FOUND TRUE)
+
   ament_lint_auto_find_test_dependencies()
 endif()