Skip email domain check when admins edit user emails (#29609)

Follow #29522

Administrators should be able to set a user's email address even if the
email address is not in `EMAIL_DOMAIN_ALLOWLIST`

(cherry picked from commit 136dd99e86eea9c8bfe61b972a12b395655171e8)

models/user/email_address.go

@@ -165,7 +165,7 @@ func ValidateEmail(email string) error {
 	return validateEmailDomain(email)
 }
 
-// ValidateEmailForAdmin check if email is a valid address when admins manually add users
+// ValidateEmailForAdmin check if email is a valid address when admins manually add or edit users
 func ValidateEmailForAdmin(email string) error {
 	return validateEmailBasic(email)
 	// In this case we do not need to check the email domain