Report recommended assertions when slot_usage says the slot is required

[turbomam]

addresses but doesn't close

• recommended attribute not removed from terms/slots when the cardinality value in the docs is '1..1' (indicating required) #672

[turbomam]

Here I wrote some one-off linting code in this schema repo.

I should have done that upstream in LinkML

I also have to decide whether the edits to the schema (removing recommended when required is already set) should be a manual edit, o r applied programatically