Assorted Desktop App repo fixes (#3065)

* Fix ESLint and turn on the check in CI

* npm audit fix

* Remove electron-rebuild, use electron-builder for robotjs

* Add mochawesome-report to eslintignore

* Remove linebreak-style

* Revert "Remove electron-rebuild, use electron-builder for robotjs"

This reverts commit be35eb7300df725e381538dd30446a9acb8ab1df.

.eslintrc.json

@@ -29,6 +29,7 @@
         "react/no-find-dom-node": 2,
         "no-underscore-dangle": ["warn"],
         "@mattermost/use-external-link": 0,
+        "linebreak-style": 0,
         "import/order": [
             2,
             {