[FIX] Issue #8166 where empty analytics setting breaks to load Piwik script

Fixing: [BUG] If the analytics setting option 'PiwikAdditionalTrackers' is whitespace only loading, loading Piwik tracker fails #8166

Fixing: [BUG] If the analytics setting option 'PiwikAdditionalTrackers' is whitespace only loading, loading Piwik tracker fails #8166

* Add ESLint rule `prefer-template`

* Add ESLint rule `template-curly-spacing `

* ESLint ignore rocketchat-livechat/assets/rocket-livechat.js

* Add ecmascript package to all packages

* Use ecmascript package for server and client on saml package

* Fix compilation