populate_intended_for prefers `task` entity with `CustomAcquisitionLabel` method

[octomike]

Summary

Apparently heudiconv prefers to use the task entity when trying to match fmaps to funcs.

elif matching_parameter == "CustomAcquisitionLabel":
        modality = op.basename(op.dirname(json_file))
        if modality == "func":
            # extract the <task> entity:
            custom_label = BIDSFile.parse(op.basename(json_file))["task"]
        else:
            # extract the <acq> entity:
            custom_label = BIDSFile.parse(op.basename(json_file))["acq"]

While this is initially unintuitive (the option is called CustomAcquisitionLabel after all) I found it's also problematic when there is more than one task. How would I match a single fmap to multiple functionals here?

Wouldn't it be better to try a shared acq label first and then only fall back to the task entity?

Platform details:

Choose one:

• Local environment (Debian, Python 3.11)

• Container

• Heudiconv version: 1.1.6

[yarikoptic]

apparently this was added in 784e946 all the way in

• ENH: Adds populate_intended_for for fmaps #482
  to complement ModalityAcquisitionLabel. And I guess that is why it is Custom, although I agree now that name is somewhat slightly misleading from its behavior...

I think we could add AcquisitionLabel or PlainAcquisitionLabel which would be making decision solely based on the _acq-<label>. Care to submit a PR adding it (just git grep CustomAcq to see all spots to change)?

[octomike]

Happy to.

I didn't duplicate create_dummy_no_shim_settings_custom_label_bids_session, because I thought it's a little over the top. Do you want me to though?

[octomike]

Is there anything I should add here? Throw it all away and start over? :)

[yarikoptic]

Addresses by #768