feat(users): Send welcome to community email in magic link signup (#6639)

Co-authored-by: hyperswitch-bot[bot] <148525504+hyperswitch-bot[bot]@users.noreply.github.com>
Files to modify:


**user.rs**
  Modify existing code

**user.rs**
  Modify existing code

**types.rs**
  Add:
    - function: private::get_email_data
    - struct: private::WelcomeToCommunity
    - impl: impl EmailData for WelcomeToCommunity