@huggingface/inference should not call /api/tasks when endpoint url is provided

[coyotte508]

cc @hanouticelina @Wauplin @SBrandeis for viz

/api/tasks is only called to load default HF model, and should only be called when no model and no endpoint url is provided.

I think maybe originates in #1107 (where model could either be an url or a string)

See also https://github.com/huggingface-internal/moon-landing/pull/13175 cc @Kakulukian