[Serving] Fix env config map generation and other veggies

[alonmr]

1. Config map resource name label value cannot be longer than 64 chars so use the function name without prepending the serving_conf prefix - fixes TestNuclioRuntime::test_workaround_for_nuclio_bug.
2. Use conda-libmamba-solver in ml-base for faster dependencies solving (like in mlrun image).
3. Set default project if not specified for artifact endpoints in httpdb.
4. with_repo docstring clarification asked by @yonishelach and @ZeevRispler

[TomerShor]

not needed if you removed the constant

[TomerShor]

Suggested change

	if labels is None:
	labels = {label_name: name}
	else:
	labels[label_name] = name
	if labels is None:
	labels = {}
	labels[label_name] = name

[rokatyy]

All this naming of name variable is a bit confusing, so what I'd suggest is having resource_name and configmap_name to reduce this confusion.