Use the same email validation on the portal as in the backend

[mlow]

It's possible for a portal user to set their email to something invalid, such as with a digit in the TLD. Doing so will result in being unable to even load the associated account in the V2 interface.

[mlow]

Some example images

Example invalid email:

Attempting to load the account

Also results in a hang on the /accounts/ listing if account with the broken email address matches the current search filter and page.

Resolves after correcting the email address from the portal or API.

[geneccx]

I believe we've fixed this on the Sonar V2 side so that it doesn't result in a broken account view. We'll look into adding the validation here too.