chore: cleanup eslint

[danez]

This cleans up two things with eslint:

1. First commit removes the unused custom rule we have for importing chalk and instead uses a built-in one from eslint to restrict the import of chalk.
2. Second commit sets the sourceType for babel to unambiguous which makes babel guess the source type. This is done because we do parse node_modules for all the import rules, so that the import rules know what modules actually export. And currently, they do print warnings. With this change, they do not anymore, as babel can parse them correctly.

This is the error:

Error while parsing /home/runner/work/cli/cli/node_modules/netlify/src/index.js
Line 1, column 0: 'import' and 'export' may appear only with 'sourceType: "module"' (1:0)
`parseForESLint` from parser `/home/runner/work/cli/cli/node_modules/@babel/eslint-parser/lib/index.cjs` is invalid and will just be ignored

...

[github-actions]

📊 Benchmark results

Comparing with 6cd52d1

Package size: 223 MB

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• T-1 (6cd52d1): 223 MB
• T (current commit): 223 MB

[lukasholzer]

nice I like cleanup!

[kodiakhq]

This PR currently has a merge conflict. Please resolve this and then re-add the automerge label.