[dashboard] /select-account is missing

[csweichel]

Bug description

I attempted to open a GitLab repository while being logged in with GitHub. After authenticating with GitLab I saw 404 after being redirected to /select-account. I must have followed this code path

gitpod/components/server/src/auth/generic-auth-provider.ts

Line 343 in df8b5cf

const url = this.env.hostUrl.with({ pathname: '/select-account' }).toString();

Steps to reproduce

1. be signed in with GitHub
2. sign in using GitLab

Expected behavior

Not a 404 but the account selection

Example repository

No response

[csweichel]

duplicate of #3754