chore: refactor domain parsing to be more general (#3448)

* change the api of domain parsing to just parseDomain and getCookieDomain
* adds getBaseDomain as the method to get the domain after any official subdomains

server/utils/authentication.ts

@@ -2,10 +2,10 @@ import querystring from "querystring";
 import { addMonths } from "date-fns";
 import { Context } from "koa";
 import { pick } from "lodash";
+import { getCookieDomain } from "@shared/utils/domains";
 import env from "@server/env";
 import Logger from "@server/logging/Logger";
 import { User, Event, Team, Collection, View } from "@server/models";
-import { getCookieDomain } from "@server/utils/domains";
 
 export async function signIn(
   ctx: Context,