feat: move Azure config to installation_config (#9481)

This PR has the following changes

1. Add `AZURE_APP_ID` and `AZURE_APP_SECRET` to installation config
2. Add Microsoft config to `super_admin/features.yml`
3. Replace usage of `ENV.fetch` with `GlobalConfigService.load` for
fetch App ID and Secret

enterprise/app/helpers/super_admin/features.yml

@@ -66,3 +66,9 @@ help_center:
   description: 'Allow agents to create help center articles and publish them in a portal.'
   enabled: true
   icon: 'icon-book-2-line'
+microsoft:
+  name: 'Microsoft'
+  description: 'Configuration for setting up Microsoft Email'
+  enabled: true
+  icon: 'icon-microsoft'
+  config_key: 'microsoft'