refactor: use Validation::getValidated() when using $this->validate() in controllers

app/Controllers/PostController.php

modules/Admin/Controllers/EpisodeController.php

modules/Admin/Controllers/EpisodePersonController.php

modules/Admin/Controllers/PodcastController.php

modules/Admin/Controllers/PodcastPersonController.php

modules/Admin/Controllers/SoundbiteController.php

modules/Admin/Controllers/VideoClipsController.php

modules/Auth/Controllers/InteractController.php

modules/Auth/Controllers/MagicLinkController.php

modules/Auth/Controllers/MyAccountController.php

modules/Fediverse/Controllers/ActorController.php

modules/Fediverse/Controllers/BlockController.php

modules/Fediverse/Controllers/PostController.php

modules/Install/Controllers/InstallController.php

...les/PodcastImport/Controllers/PodcastImportController.php

modules/PremiumPodcasts/Controllers/LockController.php

...es/PremiumPodcasts/Controllers/SubscriptionController.php

public/media/site/index.html