Fix running of tests and linting in buildspec.yml
Fix running of tests and linting in buildspec.yml

It turns out when we removed 'headless' script for npm,
we chained tests and linting without 'run-s'.
As a result, only the unit tests were running in CodeBuild.

We have now separated these into independent commands
to make them more obvious and reduce risk of error.

cumulous/web,cumulous/web,cumulous/web,cumulous/web