[WIP] ci: parallelise the running of gopherjs tests #796
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Based on #797 - this will need a rebase once #797 is merged.
See the diff this PR introduces on top of #797 here
Currently we run the gopherjs tests in sequence; this is limited to a
single CPU core because we ultimately run the tests via Node. We can
improve on this by concurrently running gopherjs test per package.
myitcv.io/cmd/concsh helps do does just that:
https://github.com/myitcv/x/blob/master/cmd/concsh/README.md
Also implemented a fix discussed in a previous issue/PR to make our list
of package exclusions explicit, via std_test_pkg_exclusions