chore(platform): remove legacy-era mail, pdf and storage sources

app/Platform/Mail/Http/Requests/MailEnvironmentRequest.php

@@ -1,27 +0,0 @@
-<?php
-
-namespace App\Platform\Mail\Http\Requests;
-
-use App\Platform\Mail\Application\MailConfigurationService;
-use Illuminate\Foundation\Http\FormRequest;
-
-class MailEnvironmentRequest extends FormRequest
-{
-    /**
-     * Determine if the user is authorized to make this request.
-     */
-    public function authorize(): bool
-    {
-        return true;
-    }
-
-    /**
-     * Get the validation rules that apply to the request.
-     */
-    public function rules(): array
-    {
-        return app(MailConfigurationService::class)->validationRules(
-            $this->string('mail_driver')->toString()
-        );
-    }
-}