Various QoL fixes for Desktop App (#2999)

* Some ESLint fixes

* Add login/logout signal to API, clear mentions on logout and flush cookies on login/logout

* Fix issue where local and HTTP-only servers would not validate correctly

* Reduce noise of renderer logging, adjust a few local renderer logs to be louder when needed

* Fallback to beginning of hostname for servers that don't change the site name

* Fix Save Image crash

* Update the name for insecure servers too

* Fix test

* Fix lint

* Reduce repetition

package.json

@@ -135,7 +135,7 @@
     "@babel/preset-typescript": "7.23.3",
     "@electron/fuses": "1.6.0",
     "@electron/rebuild": "3.6.0",
-    "@mattermost/desktop-api": "*",
+    "@mattermost/desktop-api": "file:api-types",
     "@mattermost/eslint-plugin": "1.1.0-0",
     "@types/auto-launch": "5.0.5",
     "@types/jest": "29.4.1",