PNPM does not run "pre" and "post" scripts
for user-defined scripts. This commit
removed the "preuglify" script from the
beta tester plugin so that it builds correctly.
This commit adds a `postinstall` script for
the WooCommerce and WooCommerce Beta
Tester plugins. This makes it easier to get
started since `pnpm install` will ensure all
dependencies in every project are ready.
Also updated PHPCS to support PHP 7.3.
Included better pre-commit process, covering JS too.
And removed copy/paste dealing with .less files, we never had any .less
file in this project.