[IMP] auth_signup: change email invitation condition

Currently if a user has already been invited you cannot invite him again
via the web_settings_dashboard as it automatically tries to create a new
user.
This commit changes that behaviour in case you have the mail app
installed odoo will now send an invitation email to the invited user as
long as this user has never connected.

1) Mail app not installed:
   - if user is active     > display error (this email is already in use)
   - if user not active    > activate the user
   - if user doesn't exist > create new user

2) Mail app installed:
   - if user is active && state confirmed > display popup (this email is
   already in use)
   - if user is active && never connected > resend invitation mail
   - if user is inactive > activate the user
   - if user doesn't exist > create new user and send invitation mail

This commit is related to task #54023
Closes #23081

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