[MM-14740] Consolidate configuration to support integration of MSI/GPO (#959)

* config logic consolidation

* filter out duplicate servers

* build default teams and GPO teams are not editable

* tweaks

* tweak config architecture to support tests

- config needs to load in each process (main and renderer) and then synchronize with each other
- finished saving ui functionality

* add esdoc comments to new config module

* remove old config-related files

* revert eslint comment

* don’t filter teams, duplicates are allowed

* some code review tweaks

* Remove unecessary deepCopy

* tweak for tests

* Skip test for now

Can’t seem to get this test to work, even though what is being tested works fine in the actual app.

* fix for failing test

click of ‘light’ option wasn’t triggering an update as it is selected by default, so flipped the order to first select ‘dark’ and then ‘light’

.eslintrc.json

@@ -30,7 +30,6 @@
     {
       "files": [
         "webpack.config.renderer.js",
-        "test/specs/settings_test.js",
         "test/specs/spellchecker_test.js",
         "test/specs/app_test.js",
         "test/specs/security_test.js",
@@ -51,7 +50,6 @@
         "LICENSE.txt",
         "src/utils/util.js",
         "src/main.js",
-        "src/browser/config/AppConfig.js",
         "src/browser/js/contextMenu.js",
         "src/browser/updater.jsx",
         "src/browser/js/notification.js",
@@ -78,13 +76,13 @@
         "src/browser/settings.jsx",
         "src/browser/index.jsx",
         "src/common/deepmerge.js",
+        "src/common/config/index.js",
         "src/common/config/buildConfig.js",
         "src/common/config/pastDefaultPreferences.js",
         "src/common/config/upgradePreferences.js",
         "src/common/osVersion.js",
         "src/common/config/defaultPreferences.js",
         "src/common/JsonFileManager.js",
-        "src/common/settings.js",
         "src/main/certificateStore.js",
         "src/main/mainWindow.js",
         "src/main/allowProtocolDialog.js",