Setup linters

[vinzscam]

Hey, I just made a Pull Request!

This PR configure eslint and prettier so that we run the proper checks locally and on CI.

Example:

:heavy_check_mark: Checklist

• [ ] A changeset describing the change and affected packages. (more info)
• [ ] Tests for new functionality and regression tests for bug fixes
• [ ] Screenshots attached (for UI changes)
• [x] All your commits have a Signed-off-by line in the message. (more info)

[backstage-goalie[bot]]

Changed Packages

Package Name	Package Path	Changeset Bump	Current Version
@backstage-community/cli	workspaces/repo-tools/packages/cli	none	v0.0.1

[github-actions[bot]]

This PR has been automatically marked as stale because it has not had recent activity from the author. It will be closed if no further activity occurs. If the PR was closed and you want it re-opened, let us know and we'll re-open the PR so that you can continue the contribution!

[awanlin]

Hi @vinzscam, I think a lot of this has been addressed now, going to close but feel free to re-open if there's something here we need. 👍