backport-2.1: cli: Fix support for deprecated --http-host flag #29220
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Backport 1/1 commits from #29213.
/cc @cockroachdb/release
It looks like we accidentally stopped registering the --http-host flag
in the cli package's init function recently, which completely removed
support for --http-host rather than the intended effect of deprecating
(but continuing to allow) it.
Also make the handling of deprecated/alias flags more consistent with
each other while I'm here.
Release note (bug fix): Fix support for --http-host flag that was broken
in previous 2.1 beta releases.