Testing: use spack.store.use_store everywhere (#21656)

Keep spack.store.store and spack.store.db consistent in unit tests

* Remove calls to monkeypatch for spack.store.store and spack.store.db:
  tests that used these called one or the other, which lead to
  inconsistencies (the tests passed regardless but were fragile as a
  result)
* Fixtures making use of monkeypatch with mock_store now use the
  updated use_store function, which sets store.store and store.db
  consistently
* subprocess_context.TestState now transfers the serializes and
  restores spack.store.store (without the monkeypatch changes this
  would have created inconsistencies)

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