Remove remaining references to lerna

[nicolo-ribaudo]

Q	A
License	MIT

Since we don't use lerna anymore, we should remove the lerna.json file to avoid creating confusion for new contributors.

We also don't need the lerna-changelog dependency, since that is handled by a GH action. If someone really needs to manually generate the changelog, they can still run yarn dlx lerna-changelog.

[babel-bot]

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[hzoo]

dang rip

[Sawtaytoes]

Is there a PR for when you transitions from Lerna to another technology?

I'm curious why this project isn't using Lerna anymore. I'm not partial either way, but I also saw the facebook/react repo is also no longer using Lerna either. What'd you replace it with?

[nicolo-ribaudo]

This is the PR removing lerna: #12138. The main reason is that we weren't using just lerna, but a fork.