I3InferenceModule doesn't recognize a list of length 1

[pweigel]

Describe the bug
Using I3InferenceModule with a single task in a list results in a lot of spam. It checks if it's a list but doesn't check the length. I can fix this with some other improvements I'm making to inference-related activities. I think it should also be a warning_once, otherwise, it would still spam when len(tasks)>1.

To Reproduce
Steps to reproduce the behavior:

1. Run I3InferenceModule when the model config has a tasks list containing only one task.

Expected behavior
It should recognize that there is actually only one task.

Full traceback

graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.
graphnet [MainProcess] WARNING  2024-11-07 12:24:59 - I3InferenceModule.Execute - I3InferenceModule assumes one Task but got 1. Only the first will be used.