48094: apply cleanup commands of the current theme on any theme change

* Rename zstyle `cleanup' on the context `:prompt-theme' to `restore'
  everywhere but in prompt_cleanup(). It is only used as a restore
  mechanism now.
* Ensure prompt_cleanup() continues to store its command list in the
  `cleanup' style.
* Clean up before theme switch at the end of set_prompt().
* Prepend every use of prompt_*_setup (which might modify the shell
  state in ways that require cleanup) with a cleanup run.
* Adjust `prompt restore' to do both parts of the newly split restore
  mechanism, cleanup first.

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