[MM-42538] Submit nightly builds to TestFlight for macOS (#2023)

* Initial MAS build, working on TestFlight

* Migration of old configs to MAS

* Ignore fastlane files

* Add mac app store build to nightly build

* Revert Me - For testing in PR

* Don't need to install fastlane

* BIG D

* Fix patch updater script to allow for no yml

* Nevermind, do this instead

* Update xcode

* Let's try a fake version that works

* Revert version and rename for test flight

* Use Xcode 13.0.0

* Use CircleCI build number when available

* Revert testing changes

* Remove notarize for MAS

* Change vars to MACOS instead of IOS

* Revert electron-builder to v22

* Revert package-lock.json

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

scripts/afterpack.js

@@ -27,6 +27,7 @@ function getAppFileName(context) {
     case 'win32':
         return 'Mattermost.exe';
     case 'darwin':
+    case 'mas':
         return 'Mattermost.app';
     case 'linux':
         return context.packager.executableName;