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

app/controllers/super_admin/app_configs_controller.rb

@@ -35,6 +35,8 @@ class SuperAdmin::AppConfigsController < SuperAdmin::ApplicationController
     @allowed_configs = case @config
                        when 'facebook'
                          %w[FB_APP_ID FB_VERIFY_TOKEN FB_APP_SECRET IG_VERIFY_TOKEN FACEBOOK_API_VERSION ENABLE_MESSENGER_CHANNEL_HUMAN_AGENT]
+                       when 'microsoft'
+                         %w[AZURE_APP_ID AZURE_APP_SECRET]
                        when 'email'
                          ['MAILER_INBOUND_EMAIL_DOMAIN']
                        else