"phenotype.tsv" referenced in part of validator, but this is not a BIDS file

[sappelhoff]

bids-validator/bids-validator/bids_validator/tsv/non_custom_columns.json

Line 68 in 2d923f5

"phenotype": ["participant_id", "HED"],

In BIDS we have phenotype/<whatever-name>.tsv but not phenotype.tsv. See: https://bids-specification.readthedocs.io/en/stable/modality-agnostic-files.html#phenotypic-and-assessment-data

brought up by @VisLab in #1876

[effigies]

I'm not sure if this line was ever used to implement any tests. It could be vestigial.