[lldb] Revert recent changes to HostThreadPosix::Reset (#196306) These are suspected to have caused instability in CI testing https://github.com/llvm/llvm-project/issues/191372. This reverts commits 4c225918a9e78463c9bf9cc0a26be5ae2ed1c827 and d7fac0f42a3a8a6d6cf827d1f8b38663f872fe0f (#179470 and #177572). The second change could technically stay in, but it was using the first change to fix a bug in lldb-server. So I think it's better to revert both so we don't mistakenly think the bug is still fixed.
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