`/queries:run` write errors yield a more informative error code and message

[dwinston]

Description

Invalid /queries:run calls (that is, calls with semantically invalid mongodb commands) return a 422 error with info, rather than the more generic 418.

Closes #523

Type of change

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• [ ] test_queries_run_invalid_update (status: draft that needs work)

Configuration Details: none

Checklist:

• [ ] My code follows the style guidelines of this project (have you run black nmdc_runtime/?)
• [ ] I have performed a self-review of my code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation (in docs/ and in https://github.com/microbiomedata/NMDC_documentation/?)
• [ ] I have added tests that prove my fix is effective or that my feature works, incl. considering downstream usage (e.g. https://github.com/microbiomedata/notebook_hackathons) if applicable.
• [ ] New and existing unit and functional tests pass locally with my changes (make up-test && make test-run)