Better error messages for failed logins

[JarrydLong]

Is your feature request related to a problem? Please describe.
Our error messages indicate if an account exists or not when trying to login which can result in a user enumeration attack.

It makes it easy to determine if the account that is being tested exists or not and then take it further.

Steps to reproduce:

1. Navigate to Login Page
2. Click on forgot password
3. Enter an invalid email address
4. Error Message: " This email address does not exist in our database! "
5. Now enter a valid Email
6. The Message is different

Describe the solution you'd like
We follow the same wording as WordPress core does however further discussion needs to be had around this

Additional context
Reported by Bullet / FS - 124740

[andrewlimaza]

This follows default WordPress core behavior, we rely on the WordPress login form for processing the login including failed logins and error messages.

However if it's concerning, developers may use the login_errors hook to create custom error messages - https://developer.wordpress.org/reference/hooks/login_errors/

Here are the screenshots for reference.