[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

package-lock.json

@@ -10,6 +10,7 @@
       "hasInstallScript": true,
       "license": "Apache-2.0",
       "dependencies": {
+        "@emotion/react": "11.11.4",
         "@mattermost/compass-icons": "0.1.45",
         "auto-launch": "5.0.6",
         "bootstrap": "4.6.1",
@@ -88,7 +89,7 @@
     },
     "api-types": {
       "name": "@mattermost/desktop-api",
-      "version": "5.9.0-1",
+      "version": "5.10.0-1",
       "dev": true,
       "license": "MIT",
       "peerDependencies": {