[MM-40406] Add more singletons, refactor main.ts into pieces, add tests and some cleanup + tests for additional coverage (#1890)

* Refactor main.ts dependencies into singleton pattern

* Split main.ts into testable pieces, some other refactoring for singleton pattern

* Unit tests for main/app/app

* Unit tests for main/app/config

* Unit tests for main/app/initialize

* Unit tests for main/app/intercom

* Unit tests for main/app/utils

* Add some more tests to get to 70% coverage

* Fix for linux

* Fix for alternate data dir paths

* Fix E2E test

src/main/AutoLauncher.ts

@@ -7,7 +7,7 @@ import {app} from 'electron';
 import isDev from 'electron-is-dev';
 import log from 'electron-log';
 
-export default class AutoLauncher {
+export class AutoLauncher {
     appLauncher: AutoLaunch;
 
     constructor() {
@@ -58,3 +58,6 @@ export default class AutoLauncher {
         return Promise.resolve(null);
     }
 }
+
+const autoLauncher = new AutoLauncher();
+export default autoLauncher;