Forbid hiding of the columns with no label on datatables, as these are difficult to unhide again

src/DataTables/AttachmentDataTable.php

@@ -79,6 +79,7 @@ final class AttachmentDataTable implements DataTableTypeInterface
     {
         $dataTable->add('picture', TextColumn::class, [
             'label' => '',
+            'className' => 'no-colvis',
             'render' => function ($value, Attachment $context) {
                 if ($context->isPicture()
                     && !$context->isExternal()

src/DataTables/LogDataTable.php

@@ -121,6 +121,7 @@ class LogDataTable implements DataTableTypeInterface
 
         $dataTable->add('symbol', TextColumn::class, [
             'label' => '',
+            'className' => 'no-colvis',
             'render' => static function ($value, AbstractLogEntry $context) {
                 switch ($context->getLevelString()) {
                     case LogLevel::DEBUG: