Add QC check for proper treatment of preferredExternal annotations (#…

…8012)

* Add QC check for proper treatment of preferred external

Adding check that ensures that:

1) Xrefs with preferred external must have a corresponding equivalentto on the same class
2) Xrefs with preferred external must be related to another class which are equivalent as well

* Add OMIA to xref without source check

* remove incorrect xref

* remove non-equivalent SCTID:609622007

* remove MONDO:preferredExternal from obsolete OMIM:277610 entry

* add MONDO:preferredExternal to DOID:3774, DOID:3773 is obsolete and fix OMIA

* remove incorrect xref to Orphanet:3056

* change status of Orphanet:85328 and revert prior change

* fix Orphanet:85328 status

* add correct orphanet and confirm others are obsolete

* add MONDO:equivalentTo OMIA:000605

* remove MONDO:preferredExternal from OMIM:207720 since obsolete

* remove prefExt and SCTID that can not be found

* fix obsEq

* fix proxy merges

* edits for MONDO:0010407

* edits for MONDO:0016706

* revert change for MONDO:0010407

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Co-authored-by: Trish Whetzel <[email protected]>