Strictly enforce no unused keys in yaml

[rayg1234]

This enforces config yamls to have no unused keys. The only allowed top-level keys now are {"job", "runner"} and keys that are used in variable replacements.
ie: (dataloader: ...) is allowed as long as the yaml references ${dataloader} somewhere.

OK Config:

replacement_value: 5
job: ...
runner:
  x: ${replacement_value}

NOT OK Config:

random_key: 5
job: ...
runner:
  x: 10

[lbluque]

lgtm

[codecov]

Codecov Report

Attention: Patch coverage is 96.66667% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/fairchem/core/_cli_hydra.py	96.42%	1 Missing ⚠️

Files with missing lines	Coverage Δ
src/fairchem/core/components/runner.py	80.00% <100.00%> (+0.58%)	⬆️
src/fairchem/core/_cli_hydra.py	86.36% <96.42%> (+2.87%)	⬆️