[Auth] ?redirect query param is lost after complex sso login workflow

[ryan953]

Sometimes when logging in with a ?redirect= query param, the redirect is 'lost' and the user ends up on the /issues page instead of where they're trying to go.

[ryan953]

cc @leedongwei @cathteng

[ryan953]

Sat with @cathteng, the problem seems to happen when the requested url contains a subdomain, but doesn't happen when the subdomain is omitted.

ie: https://sentry.sentry.io/toolbar/sentry/javascript/login-success/ does not redirect properly
but: https://sentry.io/toolbar/sentry/javascript/login-success/ will redirect!

[ryan953]

The description of this PR has some more details and outlines the workaround i did: #80003