e2e: add prettier and eslint

[nicobytes]

Parent Issue

#31059

Proposed Changes

This pull request focuses on improving code consistency and style by introducing ESLint and Prettier configurations, and updating the codebase to follow these standards. Additionally, it includes various minor refactors to enhance readability and maintainability.

ESLint and Prettier Integration:

• e2e/dotcms-e2e-node/frontend/eslint.config.mjs: Added ESLint and Prettier configurations to enforce coding standards.
• e2e/dotcms-e2e-node/frontend/package.json: Updated dependencies to include ESLint, Prettier, and related plugins. Added new scripts for formatting and linting the code. [1] [2]
• e2e/dotcms-e2e-node/frontend/prettier-config.json: Added Prettier configuration file to define code formatting rules.

Code Consistency and Style Improvements:

• e2e/dotcms-e2e-node/frontend/index.js: Updated all string literals to use double quotes for consistency.
• e2e/dotcms-e2e-node/frontend/locators/globalLocators.ts: Formatted object properties and added trailing commas for consistency.
• e2e/dotcms-e2e-node/frontend/locators/navigation/menuLocators.ts: Formatted code to improve readability and maintain consistent string quoting. [1] [2] [3]

Refactoring and Cleanup:

• e2e/dotcms-e2e-node/frontend/playwright.config.ts: Refactored configuration file to use consistent string literals and improved readability. [1] [2] [3] [4]
• e2e/dotcms-e2e-node/frontend/tests/contentSearch/contentData.ts: Cleaned up and formatted content data file for better readability. [1] [2] [3]
• e2e/dotcms-e2e-node/frontend/tests/contentSearch/contentEditing.spec.ts: Refactored test file to improve readability and maintain consistent string quoting. [1] [2]

Checklist

• Tests
• Translations
• Security Implications Contemplated (add notes if applicable)

This PR fixes: #31033