Change spurious 'error' log level to 'info'

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

Resolves jupyterlab#839.

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

@@ -66,7 +66,7 @@ def get_em_providers(
         try:
             provider = model_provider_ep.load()
         except Exception as e:
-            log.error(
+            log.info(
                 f"Unable to load embeddings model provider class from entry point `{model_provider_ep.name}`: %s.",
                 e,
             )