PIMS-619 React App Linting

[dbarkowsky]

🎯 Summary

PIMS-619

Adds ESLint and Prettier using similar configurations to our existing frontend.
Fixed some existing linting issues.

Same commands as the express-api to run linting.

• npm run lint to check everything
• npm run lint:fix to fix the easy stuff automatically
• npm run check to check only the prettier rules
• npm run format to fix the prettier rule violations

🔰 Checklist

• I have read and agree with the following checklist and am following the guidelines in our Code of Conduct document.

• 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 where required.
• I have tested my changes to the best of my ability.
• My changes generate no new warnings.

[TaylorFries]

scripts lint, lint:fix, check, and format all work as expected.