Ensure all values listed in examples for a slot actually pass validation

[pkalita-lbl]

In microbiomedata/nmdc-field-notes#184, it was pointed out that there are a number of values listed as examples for some slots which do not conform to the validation rules of the slot itself. I manually confirmed that these slots have invalid examples:

• local environmental context
• depth, meters

I didn't check every slot so there very well may be more.

This task is to:

1. repair or remove the current invalid examples
2. develop a test in this repo that validates all of the example values and ensure that the build & release process fails if this test fails

[turbomam]

It would be great if we could make this general enough to be used in totally separate repos