Switch to js-yaml for better YAML formatting

[flippingbits]

This PR replaces the existing JSON-to-YAML formatter, json-to-pretty-yaml, with js-yaml.

The main intention behind this PR is to render multiline strings in a clean way.

Before:

After:

[flippingbits]

My apologies for the forced push. I had to rewrite the Git history since I accidentally committed a file that does not belong here 😰

[sonarcloud[bot]]

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