[BUG] ASLTotalAcquiredPairsASLContextLength check is incorrect

[tsalo]

Describe your problem in detail.

TotalAcquiredPairs is compared against the number of rows in aslcontext, but the TotalAcquiredPairs value should be the number of control-label pairs, while the aslcontext file should have one row for each volume.

Describe what you expected.

I think the check should be that TotalAcquiredPairs is <= the number of rows in the aslcontext file, since at most the aslcontext file could have 2x the number of pairs, if all of the volumes in the file as control or label volumes, but at minimum there could just be a single pair with a bunch of m0scan, deltam, and/or cbf volumes filling out the rest of the asl file.

BIDS specification section

bids-specification/src/schema/rules/checks/asl.yaml

Lines 199 to 213 in c2685cc

	ASLTotalAcquiredPairsASLContextLength:
	issue:
	code: TOTAL_ACQUIRED_VOLUMES_NOT_CONSISTENT
	message: |
	The number of values for 'TotalAcquiredPairs' for this file does not match number of
	volumes in the associated 'aslcontext.tsv'.
	'TotalAcquiredPairs' is the original number of 3D volumes acquired for each volume defined in the
	associated 'aslcontext.tsv'.
	level: warning
	selectors:
	- suffix == "asl"
	- type(associations.aslcontext) != "null"
	- '"TotalAcquiredPairs" in sidecar'
	checks:
	- aslcontext.n_rows == sidecar.TotalAcquiredPairs

[effigies]

Yeah, the check should either be a bound or we could count pairs.