Merge bitcoin/bitcoin#24515: Only load BlockMan in BlockMan member functions

f865cf8ded2b2fbc82a6fbc41226d991909a6880 Add and use BlockManager::GetAllBlockIndices (Carl Dong)
28ba0313eac37e4a900b7e97af7169ce999c4024 Add and use CBlockIndexHeightOnlyComparator (Carl Dong)
12eb05df63f930969115af6dc66e2e5d02f2a517 move-only: Move CBlockIndexWorkComparator to blockstorage (Carl Dong)
c600ee38168a460d3026eae0e289c976194aad14 Only load BlockMan in BlockMan member functions (Carl Dong)
42e56d9b188f97c077ed2269e24acc0be35ece17 style-only: No need for std::pair for vSortedByHeight (Carl Dong)
3bbb6fea051f4e19bd2448e401a6c4e9b4cc7a41 style-only: Various blockstorage.cpp cleanups (Carl Dong)
5be9ee3c54dcb396ff52fc8c8b7e4e6e39ec4a3b refactor: more const annotations for uses of CBlockIndex* (Anthony Towns)

Pull request description:

  The only important commit is "Only load BlockMan in BlockMan member functions", everything else is all just small style changes.

  Here's the commit message, reproduced:
  ```
  This commit effectively splits the "load block index itself" logic from
  "derive Chainstate variables from loaded block index" logic.

  This means that BlockManager::LoadBlockIndex{,DB} will only load what's
  relevant to the BlockManager.
  ```

ACKs for top commit:
  ajtowns:
    ACK f865cf8ded2b2fbc82a6fbc41226d991909a6880 ; code review only
  MarcoFalke:
    review ACK f865cf8ded2b2fbc82a6fbc41226d991909a6880 🗂

Tree-SHA512: 7b204d782834e06fd7329d022e2ae860181b4e8105c33bfb928539a4ec24161dc7438a9c4d4ee279dcad77de310c160b997bb8aa18923243d0fd55ccf4ad7c3a

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