bug#62694: 30.0.50; eglot-tests fails with recent pylsp

[Eli Zaretskii]

> Cc: 62694@debbugs.gnu.org
> From: João Távora <joaotavora@gmail.com>
> Date: Fri, 7 Apr 2023 11:57:07 +0100
> 
> > We're not speaking about Emba, this is a general rule.
> 
> You're not solving a real problem, a problem that human beings in the
> world are facing and being sad with. In my view you're solving a problem
> that you fabricated and are resisting to solve with a simple one liner.

No, this is not a fabricated problem.  It is a real one.  Please help
Michael solve it, at the very least by skipping the test when the LSP
server is not up to the job.  Bonus points for making the test more
tolerant.