Remove deidentify coverage checkbox and related code

[jtquach1]

Describe your changes

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Removed "Deidentify coverage" checkbox and related code, untracked src/db.json (doing gim rm), and updated package-lock.json.

Issue ticket number and Jira link

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https://jira.mitre.org/browse/REMS-506

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[plarocque4]

Looks good