Set a maximum test run-time of 20 minutes to:
- fail faster
- avoid wasting CI resources
- set a bound on the test time (if tests take longer than 20 minutes we
need to invest in parallelizing them...)
Timeout looks like:
-- Tests exited non-zero: Process terminated due to timeout
-- No output to stderr.
CMake Error at /…/neovim/cmake/RunTests.cmake:86
(message):
functional tests failed with error: Process terminated due to timeout
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