* test/Makefile.in: Distinguish between parallel and not-parallel
tests. Mark lisp/autorevert-tests.log, lisp/filenotify-tests.log
and lisp/net/tramp-tests.log to run not-parrallel. (Bug#80164)
* test/README: Some of the tests do not run parallel when
expensive tests are activated.
* test/infra/gitlab-ci.yml (.job-template): Use "make -j".
Makefile knows how to handle parallel runs properly.
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