Delete a specific treatment rule from JSON

[cbizon]

Fixes https://github.com/NCATSTranslator/Feedback/issues/1277.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 47.33%. Comparing base (9594469) to head (d151152).
⚠️ Report is 18 commits behind head on main.
see 1 file with indirect coverage changes

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