[5.8] Add ends_with validation rule

[jasonmccreary]

A starts_with validation rule exists, however an ends_with does not. Given the symmetry between other validation rules as well as the startsWith and endsWith string helper methods, why not add it. Infinitely more expressive than the nasty regex:/(foo|bar)$/ alternative.

Rule attributes are the same as starts_with, for example:

$rules = [
    'email' => 'required|ends_with:laravel.com,jasonmccreary.me',
];

[jasonmccreary]

If merged, I will open PRs to update the docs and validation.php lang file accordingly.

[amaelftah]

glad it finally got merged 👍 , mine didn't pass #26652

[jasonmccreary]

You have to sell it in the PR notes. 😎 You were also missing code for the message replacement.

[amaelftah]

@jasonmccreary totally agree 👌