fix: cli: Hide lotus-worker set command

[rjan90]

Related Issues

Fixes #10210, Fixes #7866

Proposed Changes

Based on the discussion in #10210 and in #7866, I propose to hide this command and start the deprecation process of this function.

The desired feature from our users point of view will be fulfilled by the lotus-worker tasks enable/disable, which allows SPs to gracefully shutdown the lotus-worker even with incoming sealing tasks:

1. SP have a lot of incoming sealing tasks in the pipeline, but want/need to shut down worker nr.124 for maintainence/upgrade
2. Issue the lotus-worker tasks disable --all, and let the remaining sealing tasks finish and let other workers fetch the finished sectors.
3. lotus-worker stop to detach it and do maintenance/upgrades.

Additional Info

A follow up here is to document how to gracefully shutdown a lotus-worker to our users: filecoin-project/lotus-docs#511

Checklist

Before you mark the PR ready for review, please make sure that:

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• New features have usage guidelines and / or documentation updates in
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