Bug report

Describe the bug

The test case t8_gtest_compute_first_element_serial does not work on the github Mac OS runner. More specifically, the test for large numbers stalls. From what I investigated, it seems like it because the sum_0 in t8_cmesh_get_first_element_of_process runs into some overflow. At least it only stalls when we actually want to access its value after computing it.

Other things to note:

• The variable size in this test case is of type uint64_t but then passed to t8_cmesh_get_first_element_of_process, which expects uint32_t. However, that did not cause the problem.
• I ran it on a Mac Mini and there everything was fine, so it is not a general Mac OS issue.

I already put WAY more time in it than I should have, so for now I deactivate the test case (in PR TODO) for the Mac OS workflow.

To Reproduce
remove the if (NOT APPLE) condition I added to the test case.

Estimated priority
Which of these is most applicable (remove the others):

"Priority: low" Should be solved eventually