[MM-59552] Remove unsafe-inline from internal CSP, replace with nonce and rework some dynamic styling (#3120)

* Remove unsafe-inline

* Fix dynamic dark mode loading

* Include nonce generator for CSP for styles

* Add nonce provider for react-select

* Fix test

src/types/window.ts

@@ -44,6 +44,7 @@ declare global {
             goBack: () => void;
             checkForUpdates: () => void;
             updateConfiguration: (saveQueueItems: SaveQueueItem[]) => void;
+            getNonce: () => Promise<string | undefined>;
 
             updateServerOrder: (serverOrder: string[]) => Promise<void>;
             updateTabOrder: (serverId: string, viewOrder: string[]) => Promise<void>;