resume efforts to detect examples coverage

[turbomam]

• are all classes instantiated at least one?
• are exhaustive examples provided for important classes like Biosample?

examples/output/Biosample-exhaustive_report.yaml: src/data/valid/Biosample-exhasutive.yaml
    $(RUN) exhaustion-check \
        --class-name Biosample \
        --instance-yaml-file $< \
        --output-yaml-file $@ \
        --schema-path src/schema/nmdc.yaml

[turbomam]

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