build: split CI rules in Makefile

Some CI jobs compile Node and run the tests on different machines.
This change enables collaborators to have finer control over what runs
on these jobs, such as the exact suites to run. The test-ci rule was
split into js and native, to allow for addons to be compiled only on
the machines that are going to run them.

Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Rod Vagg <rod@vagg.org>
PR-URL: https://github.com/nodejs/node/pull/7317