DATAP-1619 Upgraded to ESLint v9 for CCDB UI

[cdmh219]

Upgraded CCDB UI to use ESLint v9. This included use of the updated flat configuration format, and will work for both the actual application and related Cypress tests.

Additions

• New config file eslint.config.mjs (with flat configuration)

Removals

• Old config file .eslintrc
• Unnecessary rules for React Hooks and React-Redux (many aren't supported by ESLint v9, and should be covered by eslint-plugin-react)

Changes

• Reordering of functions in several files to guarantee use of defined functions everywhere

Testing

• Run yarn run lint and ensure no errors/warnings are present
• Run yarn test to ensure all unit tests still run as expected with updated config
• Run yarn run cypress run to ensure all automated high-level tests still run as expected with updated config

Screenshots

Notes

Todos

Checklist

• Changes are limited to a single goal (no scope creep)
• Code can be automatically merged (no conflicts)
• Code follows the standards laid out in the front end playbook
• Passes all existing automated tests
• New functions include new tests
• New functions are documented (with a description, list of inputs, and expected output)
• Placeholder code is flagged
• Visually tested in supported browsers and devices
• Project documentation has been updated (including the "Unreleased" section of the CHANGELOG)

[flacoman91]

Looks good to me! Thanks for taking care of this!