⚡ Remove non-null assertions for Db collections (#3111)

* 📘 Remove unions to `null`

* ⚡ Track `Db` initialization state

* 🔥 Remove non-null assertions

* 👕 Remove lint exceptions

* 🔥 Remove leftover assertion

packages/cli/src/UserManagement/auth/jwt.ts

@@ -37,7 +37,7 @@ export function issueJWT(user: User): JwtToken {
 }
 
 export async function resolveJwtContent(jwtPayload: JwtPayload): Promise<User> {
-	const user = await Db.collections.User!.findOne(jwtPayload.id, {
+	const user = await Db.collections.User.findOne(jwtPayload.id, {
 		relations: ['globalRole'],
 	});