ci: don't test BundleGeneratorTest

This test uses shared global resources and doesn't work well with the CI
infrastructure we have. It is tested by nightly builders however.

.gitlab/ci/ctest_exclusions.cmake

 set(test_exclusions
+  # This test hits global resources and can be handled by nightly testing.
+  # https://gitlab.kitware.com/cmake/cmake/-/merge_requests/4769
+  "^BundleGeneratorTest$"
 )
 
 if (CTEST_CMAKE_GENERATOR MATCHES "Visual Studio")