Issue #3264122: Move all aggregator tests to the module in preperation of removal in d10

core/modules/aggregator/tests/src/Functional/Jsonapi/FeedTest.php

 <?php
 
-namespace Drupal\Tests\aggregator\Functional\JsonApi;
+namespace Drupal\Tests\aggregator\Functional\Jsonapi;
 
 use Drupal\aggregator\Entity\Feed;
 use Drupal\Core\Url;