Accepting already registered User email

### Description of issue
Accepting already registered User email

### Expected result
Not to register already registered user Email and to show alert Your are already our customer

### Actual result
registering already registered user Email and it's not showing alert Your are already our customer

### Steps to reproduce
1. check the user email already registered
2. show alert if user email already registered
3.

```
Path: /pages/login/login
Browser: Chrome 112.0.0.0 on Windows 10
Viewport: 1504 x 860 @1.5x
Language: en-US
Cookies: Enabled
```

[Open in BrowserStack](https://www.browserstack.com/user/try-live?url=https%3A%2F%2Fdeploy-preview-1--creckett.netlify.app%2Fpages%2Flogin%2Flogin&os=Windows&os_version=10&browser=Chrome&browser_version=112.0&resolution=1504x860&speed=1&start=true&ref=netlify-source)

Submitted from [Netlify Deploy Preview #1](https://deploy-preview-1--creckett.netlify.app/pages/login/login)