poco: add checkPhase

This executes at least part of the testsutie.

All testsuites that require a service running in the background
(Postgress, MongoDB, MariaDB, ...) have been skipped. If one attempts to
run them, this likely requires a nixosTest to do so and provide the
dependencies.

Some tests I had to skip, because they break on darwin. Perhaps fixes
for theste test can be developed and upstreamed, but that requires more
expertise than I possess.

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