Started happening after the merge of #14647.

Example run: https://github.com/ziglang/zig/actions/runs/4439981911/jobs/7793180394

Unfortunately the output is completely unhelpful:

...
[20/21] Install the project...
-- Install configuration: "Debug"
0
Main test suite...
Error: The operation was canceled.

Unclear why this is happening. So far no one has reproduced the issue locally. If the issue happened locally we would be able to attach a debugger to the process and find out why it is stalled.