Email verification shouldn't be required when signing up from an email invite

[corywatilo]

I invited a user to a project and it sent them an email to accept the invite.

1. User clicked link in invite, entered a password, and created an account
2. User was taken to email verification screen
3. User had to return to email to click the link to verify the email address

This seems unnecessary since they had just clicked a link from their email.

If we're able to distinguish between invite links sent manually vs invite links clicked via email, this would be a nice enhancement and would feel more polished than having to return to email to click another link.

[abhi12299]

This could be implemented by sending a different verification token in the email. The invite link shown on the posthog UI remains the same, which means copying the link and sending it manually results in the current behaviour. However, the link sent in the email would be different and mark the user as verified upon signing up.

I can work on this. How's the approach?