[CI] Re-use whisper_client for all tests (#30148)

Signed-off-by: NickLucche <nlucches@redhat.com>

tests/entrypoints/openai/test_transcription_validation_whisper.py

@@ -32,13 +32,9 @@ async def whisper_client(server):
 
 
 @pytest.mark.asyncio
-async def test_basic_audio(mary_had_lamb):
-    server_args = ["--enforce-eager"]
-
+async def test_basic_audio(whisper_client, mary_had_lamb):
     # Based on https://github.com/openai/openai-cookbook/blob/main/examples/Whisper_prompting_guide.ipynb.
-    with RemoteOpenAIServer(MODEL_NAME, server_args) as remote_server:
-        client = remote_server.get_async_client()
-        transcription = await client.audio.transcriptions.create(
+    transcription = await whisper_client.audio.transcriptions.create(
         model=MODEL_NAME,
         file=mary_had_lamb,
         language="en",