Commits on Dec 7, 2021

1. pvf-precheck: Strip PastCodeMeta …

   This PR is a part of
   #3211.
   
   This PR prepares ground for the following runtime changes required for
   PVF pre-checking. Specifically, we do several changes here:
   
   1. We remove `validation_code_at` and `validation_code_hash_at`. Those
      functions are not used. They were added in the early days with intent
      to use it later but turned out that we do not need them.
   2. We replace `validation_code_hash_at` with just `current_code_hash`
      for the case of inclusion and candidate checking.
   3. We also replace `last_code_upgrade` with a direct query into
      `FutureCodeHash` and `UpgradeRestrictionSignal`. Those in conjunction
      should replace the logic that was used for allowing/disallowing
      upgrades. This requires special attention of the reviewers.
   4. Then we remove the machinery required to support those queries.
      Specifically the code related to `UseCodeAt`. We do not need it since
      we do not answer the historical queries. However, we still leave all
      the data on-chain. At some point we may clean it up, but that would
      be needed to be done with a dedicated migration which can be done as
      follow-up.
   5. Some now irrelevant tests were removed and/or adapted.

   

   pepyakin committed Dec 7, 2021
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