Downgrade spurious 'error' logs

Since it is expected that not all model providers will be loadable, it
is wrong to log the case that one cannot be loaded with level 'error'.

Resolves #839.

packages/jupyter-ai-magics/jupyter_ai_magics/utils.py

@@ -36,10 +36,7 @@ def get_lm_providers(
             )
             continue
         except Exception as e:
-            log.error(
-                f"Unable to load model provider `{provider_ep.name}`. Printing full exception below."
-            )
-            log.exception(e)
+            log.warning(f"Unable to load model provider `{provider_ep.name}`", exc_info=e)
             continue
 
         if not is_provider_allowed(provider.id, restrictions):
@@ -66,7 +63,7 @@ def get_em_providers(
         try:
             provider = model_provider_ep.load()
         except Exception as e:
-            log.error(
+            log.warning(
                 f"Unable to load embeddings model provider class from entry point `{model_provider_ep.name}`: %s.",
                 e,
             )