zoom-us: add simple test

This test starts zoom with an Xvfb X server and
verifies that the "Zoom Workplace" window is created.
zoom is started with `prlimit` to avoid problems like
https://github.com/NixOS/nixpkgs/issues/371488 .

Note: During my experiments, it turned out that if certain
libraries are missing (I don't recall which ones),
then zoom still opens its Workplace window,
then immediatelly closes it again.
To reduce the likelihood of the test passing in
that scenario, another "sleep 20" is included.

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