Have game server reject banned players (#3683)

## Description:

The jwt now contains a "role" field, the game server checks if that role
=== "banned", and rejects them from connecting to games

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

evan

src/core/ApiSchemas.ts

@@ -30,6 +30,11 @@ export const TokenPayloadSchema = z.object({
   iss: z.string(),
   aud: z.string(),
   exp: z.number(),
+  role: z
+    .enum(["root", "admin", "mod", "flagged", "banned"])
+    // In case new roles are added in the future.
+    .or(z.string())
+    .optional(),
 });
 export type TokenPayload = z.infer<typeof TokenPayloadSchema>;