test: extend linting to customized test-project eslint config files

[MikeMcC399]

Situation

eslint.config.mjs uses { ignores: ['test-project/'] } since most files are directly scaffolded from Cypress, however this means that customized files are also not linted.

There are currently some minor formatting differences in example ESLint config files in test-project/eslint-configs compared to how they are shown in the README document.

Change

Extend linting to include:

• test-project/eslint.config.mjs
• test-project/eslint-configs

Make changes using npx eslint --fix.

Manually change test-project/eslint-configs/eslint.globals.mjs to conform to change made by Prettier to embedded JavaScript in Markdown in README > Cypress globals section.

Verification

npm run lint

and confirm that there are no errors reported.

[cypress-app-bot]

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