fix: remove lint:ci and change lint task on ci.yml to not use GH formatter

[pdrmdrs]

Relates to sumup-oss/foundry#827.

Purpose

You use the library (eslint-formatter-github) in several repositories, which has a hard-coded private key to the authorized GitHub app in the source code. This is a possible security vulnerability. The certificate gives every user read/write permissions to your GitHub actions check. In addition, metadata from non-public repositories can also be viewed.

Approach and changes

• Stop using eslint-formatter-github and revoke access to the repository

[sumup-clark]

Hey @pdrmdrs,
we are super excited that you are contributing! 🎉There's one more thing you need to do. Please accept our Contributor License Agreement. It helps you and us to collaborate on clear terms and focus on what we love most: code.

Thanks!

[github-actions]

🎉 This PR is included in version 1.6.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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