Issue #3455651 by Marcus_Johansson: Catch errors and show them on the Explorers

modules/ai_api_explorer/ai_api_explorer.services.yml

modules/ai_api_explorer/css/api_explorer.css

modules/ai_api_explorer/src/ExplorerHelper.php

modules/ai_api_explorer/src/Form/ChatGenerationForm.php

...les/ai_api_explorer/src/Form/EmbeddingsGenerationForm.php

...les/ai_api_explorer/src/Form/ModerationGenerationForm.php

...s/ai_api_explorer/src/Form/SpeechToTextGenerationForm.php

...es/ai_api_explorer/src/Form/TextToImageGenerationForm.php

...s/ai_api_explorer/src/Form/TextToSpeechGenerationForm.php

...ration/config/install/ai_external_moderation.settings.yml

.../provider_openai/src/Plugin/AiProvider/OpenAiProvider.php