IBX-10066: Change lint config to 2.0

[GrabowskiM]

🎫 Issue	IBX-10066

Description:

For QA:

Documentation:

[Copilot]

Pull Request Overview

This PR updates the linting configuration and CI setup for frontend code. Key changes include:

• Adding an ESLint configuration file that imports the Ibexa lint configuration.
• Updating the GitHub Actions workflow for the frontend to include additional file patterns and bumping the Node.js version from 14 to 20.

Reviewed Changes

Copilot reviewed 3 out of 6 changed files in this pull request and generated no comments.

File	Description
eslint.config.mjs	Added a new ESLint config file that imports and applies Ibexa config.
.github/workflows/frontend-ci.yaml	Expanded file glob patterns to include TS/TSX/SCSS files and updated Node version to 20.

Files not reviewed (3)

• .eslintrc.json: Language not supported
• ibexa.tsconfig.json: Language not supported
• package.json: Language not supported