Fix case sensitive email confirmation on signup

What does this MR do?

This MR fixes a bug where the email confirmation input value is case sensitive. For example, if the email input is myemail@example.com and the email confirmation input is Myemail@example.com the form would fail to submit.

Interestingly, the inverse was not a bug. If the email input is Myemail@example.com and the email confirmation input is myemail@example.com the form would not fail to submit.

Are there points in the code the reviewer needs to double check?

Nothing specific :)

Why was this MR needed?

I ran into this bug while signing up. Since it's a server side validation I had to re-enter my password.

Screenshots (if relevant)

Before gif:

After gif:

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• [-] Documentation created/updated
• [-] API support added
• [-] Tests added for this feature/bug
• Review
  • [-] Has been reviewed by UX
  • [-] Has been reviewed by Frontend
  • Has been reviewed by Backend
  • [-] Has been reviewed by Database
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together

What are the relevant issue numbers?