[Merge] 'choroid plexus cell' into 'choroid plexus epithelial cell'

[ghost]

CL term
CL:4023073 'choroid plexus cell'

Suggested replacement (merge above term into the winning term below)
CL:0000706 'choroid plexus epithelial cell'

Reason for deprecation
See #2043.

[ghost]

Pending Q: This class is in the human_reference_atlas subset.
Get confirmation if this obsoleted class should be removed from the subset and if 'choroid plexus epithelial cell' should be added to the subset.

@emquardokus, do you work with the human_reference_atlas. If so, can you advise?

[anitacaron]

The human_reference_atlas subset is generated from the ASCT+B tables. The complete answer is in the linked PR.