Refactor install wizard and mail configuration

app/Http/Requests/CompanyMailConfigurationRequest.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace App\Http\Requests;
+
+use App\Services\MailConfigurationService;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class CompanyMailConfigurationRequest 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
+    {
+        if ($this->string('use_custom_mail_config')->toString() !== 'YES') {
+            return [
+                'use_custom_mail_config' => ['required', 'string', Rule::in(['YES', 'NO'])],
+                'mail_driver' => ['nullable', 'string'],
+            ];
+        }
+
+        return app(MailConfigurationService::class)->validationRules(
+            $this->string('mail_driver')->toString(),
+            true
+        );
+    }
+}