fix: align whisper transcriber api with parakeet (#602)

* Documents transcriber api

* Update whisper transcriber api to match parakeet

* Update api transcription spec

* Return 400 for unsupported file type

* Add params to api spec

* Update whisper transcriber implementation to match parakeet

server/tests/test_gpu_modal_transcript.py

@@ -272,6 +272,9 @@ class TestGPUModalTranscript:
                 for f in temp_files:
                     Path(f).unlink(missing_ok=True)
 
+    @pytest.mark.skipif(
+        not "parakeet" in get_model_name(), reason="Parakeet only supports English"
+    )
     def test_transcriptions_error_handling(self):
         """Test error handling for invalid requests."""
         url = get_modal_transcript_url()