fix: General conditional compilation attributes

[upbqdn]

Motivation

See https://blog.rust-lang.org/2024/05/06/check-cfg.html

This change in beta causes CI errors in docs compilation.

PR Author Checklist

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• Will the PR name make sense to users?
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• Is there a summary in the CHANGELOG?
• Can these changes be split into multiple PRs?

Solution

• Remove the [cfg(tor)] conditional compilation attributes.
  The conditional compilation attributes for tor were redundant since we can do fine using only features.
• Add tokio_unstable to unexpected_cfgs.
• Fix tokio_unstable in zebrad.

Reviewer Checklist

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• Does the PR scope match the ticket?
• Are there enough tests to make sure it works? Do the tests cover the PR motivation?
• Are all the PR blockers dealt with?
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[oxarbitrage]

This PR should merge as it is only failing in Windows.

[arya2]

@Mergifyio refresh

[mergify]

refresh

✅ Pull request refreshed

[arya2]

This PR should merge as it is only failing in Windows.

It was the extra-reviews label that github-actions added.