Add custom exception classes for export errors

Introduced `ExportRuntimeException` and `ExportLogicException` to better categorize exceptions in the export process. Updated `ExportGenerationException` to extend `ExportRuntimeException` for clearer hierarchy and improved maintainability.

src/Bundle/ChillMainBundle/Export/Exception/ExportGenerationException.php

@@ -11,4 +11,4 @@ declare(strict_types=1);
 
 namespace Chill\MainBundle\Export\Exception;
 
-class ExportGenerationException extends \RuntimeException {}
+class ExportGenerationException extends ExportRuntimeException {}

src/Bundle/ChillMainBundle/Export/Exception/ExportLogicException.php

@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Chill\MainBundle\Export\Exception;
+
+class ExportLogicException extends \LogicException {}

src/Bundle/ChillMainBundle/Export/Exception/ExportRuntimeException.php

@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Chill\MainBundle\Export\Exception;
+
+class ExportRuntimeException extends \RuntimeException {}