feat: remove previews - #491

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This unfortunately removes all previews. A follow up is needed to add it from GraphQL

@wolfy1339 do you think it's worth a revert of this PR in the meantime? I'm not sure I understand the scope of the issue.

I don't think a revert is warranted here.

We can probably handle it in the packages that have GraphQL themselves.

• @octokit/core
• @octokit/graphql
• octokit (octokit.js)

Types would need to be handled there

It looks like this broke plugin-enterprise-server.js as well - I should've taken a closer look and remembered that there are still old supported versions of GHE that have references to previews.

On the upside, GHE 3.2 (which had the majority of the preview implementation is deprecated: https://docs.github.com/en/enterprise-server@3.7/admin/all-releases

I'll need to check 3.3 (set to deprecate next week 01.18.2023) and 3.4 to make sure they are all gone from GHE versions - if that's the case we can just drop support for those versions as well and not rollback.

Thoughts?

Update: Two instances have been left out in the REST API descriptions though they are defunct by v3.3.

@wolfy1339 It looks like we have two options here:

1. Revert
2. Clean up the files like this and deprecate v3.2 and v3.3 and move on.

Let me know your thoughts when you get the chance. Thanks!

Sounds good