[Feature]: Custom sign-up confirmation page

[SuaYoo]

Description

Users should see a custom external self-signup confirmation page in the app before completing org setup.

Requirements

New confirmation view that includes:

1. Instructions for checking the user's email client for the invite email
2. Button to resend invitation email

Context

Current Stripe confirmation screen does not include instructions on what to expect next, nor the email the user just used to sign up with:

The new view should be consistently styled with the "Welcome" view: