chore(deps): migrate to ESLint extends config structure

[MikeMcC399]

Situation

• The ESLint 9.22.0 release provided a new config feature described in the blog article Evolving flat config with extends and which is now the documented way to construct ESLint Configuration Files. The eslint-plugin-cypress > README has also now been updated to describe using the defineConfig() helper function together with the extends syntax.

• The ESLint configuration eslint.config.mjs uses defineConfig without using extends, so it does not yet take full advantage of this feature.

Change

Update the ESLint configuration eslint.config.mjs:

• Use the extends syntax

• Use the globalIgnores helper function to ignore files in the temporary build directory created by vite build

• Align import naming for best agreement with ESLint, typescript-eslint and eslint-plugin-cypress documentation

• change TO-DO to TODO:, following a convention to write it this way.

Remove a currently unused eslint-disable-next-line directive in backend/types.ts.

Update to latest ESLint components:

From	To
@eslint/[email protected] (implicit)	@eslint/js@^9.37.0 (explicit)
@typescript-eslint/parser@^8.35.1 (explicit)	@typescript-eslint/parser@^8.46.0 (implicit)
eslint@^9.30.1	eslint@^9.37.0
eslint-plugin-cypress@^5.1.0	eslint-plugin-cypress@^5.2.0
typescript-eslint@^8.35.1	typescript-eslint@^8.46.0

Verification

git clean -xfd
yarn
yarn run prettier
yarn vite build
yarn eslint

Confirm no errors reported and no changes made.

[cypress-app-bot]

• Create a Draft Pull Request if your PR is not ready for review. Mark the PR as Ready for Review when you're ready for a Cypress team member to review the PR.