[authn] handle invalid invitation token gracefully in signup page

Bug Description

In case of invalid/used/expired invitation tokens, we still show the Sign Up page which is an invalid state to be at.

As the outcome after filling the sign up page would be this:

Expected Behaviour

Ideally, we should redirect the users to the Login Page where we should display the error message: "invalid/used/expired invitation token. Please contact your admin."

How to Reproduce

1. Create a user invitation
2. Use the invitation once, log out, and use the same link again
3. Or update the invitation token from the URL to something else

Version Information

• Signoz version: latest
• Browser version: NA
• Your OS and version: NA
• Your CPU Architecture(ARM/Intel): NA

Additional Context

NA