* Update focalboard to be compatible with mattermost v6
* Point to the new plugin API version
* Fix collectors linter issues
* Move all CI jobs to 1.16
* File `package-lock.json` updated.
* Use `cross-env` for setting environment variables in npm scripts.
* Remove all the mentions of `win-node-env` because it is no longer needed for running npm scripts.
Co-authored-by: Chen-I Lim <46905241+chenilim@users.noreply.github.com>