Merge bitcoin/bitcoin#23280: init: Coalesce Chainstate loading sequence between {,non-}unittest codepaths

7f15eff2ddd86034e84a19413e1a42883987f660 style-only: Remove redundant scope in *Chainstate (Carl Dong)
89bec827fdea1cedd560be85201f04e0a78aa48d Collapse the 2 cs_main locks in LoadChainstate (Carl Dong)
3b1584b794499158e0df07bd1bee1b803c568614 Remove all #include // for * comments (Carl Dong)
9a5a5a3d08b2c130ab9147914739ff3583b0dc84 test/setup: Use LoadChainstate (Carl Dong)
c541da0d62eaf5e96eca00d7508899f98bdfc1bc node/chainstate: Add options for in-memory DBs (Carl Dong)
ceb979034184345a662be4e3b327a573fbb31c63 node/caches: Remove intermediate variables (Carl Dong)
ac4bf138b849a8544798f3891d6623803040c265 node/caches: Extract cache calculation logic (Carl Dong)
15f2e33bb3d1ad3bc997f6a84956337f46495091 validation: VerifyDB only needs Consensus::Params (Carl Dong)
4da9c076d1cf12728730bb1f7e8906d4e9bfaba5 node/chainstate: Decouple from ShutdownRequested (Carl Dong)
05441c2dc5f60e2025476d8ec94c9025032d118c node/chainstate: Decouple from GetTime (Carl Dong)
2414ebc18b8bebf79c47e58a4293d0fc6420a811 init: Delay RPC block notif until warmup finished (Carl Dong)
8d466a8504bfb81ce8699d650aa72ec9cc8b0a54 Move -checkblocks LogPrintf to AppInitMain (Carl Dong)
aad8d597890c3707ae96fdb2b9fadc270ca574dd node/chainstate: Reduce coupling of LogPrintf (Carl Dong)
b345979a2b03b671c0984edd7e48e0baec2e2f34 node/chainstate: Decouple from concept of uiInterface (Carl Dong)
ca7c0b934db68acdc410e3a82f1ed898382da2e5 Split off VerifyLoadedChainstate (Carl Dong)
adf4912d77496b9a243476c5944528f95641f14d node/chainstate: Remove do/while loop (Carl Dong)
975235ca0a8f5bcf9df880698b3b0d4bbde9f7fb Move init logistics message for BAD_GENESIS_BLOCK to init.cpp (Carl Dong)
8715658983a0a07c56513acd8ded8dfc59c5c169 Move mempool nullptr Assert out of LoadChainstate (Carl Dong)
9162a4f93ef5aeb57fe11a6e09f5881cf431f5e6 node/chainstate: Decouple from concept of NodeContext (Carl Dong)
c7a5c46e6fd6d6ff46ca7a65fc3f0fff3cbdb24e node/chainstate: Decouple from ArgsManager (Carl Dong)
ae9121f958a4124ea6238cad0c3f2acb8b9eb4bb node/chainstate: Decouple from stringy errors (Carl Dong)
cbac28b72f5b831f6f84b7628f73e85627af3d94 node/chainstate: Decouple from GetTimeMillis (Carl Dong)
cb64af9635a9553e335f2dc0b1cca20c6bbd0933 node: Extract chainstate loading sequence (Carl Dong)

Pull request description:

  This PR:
  1. Coalesce the Chainstate loading sequence between `AppInitMain` and `*TestingSetup` (which makes it more tested)
  2. Makes the Chainstate loading sequence reusable in preparation for future work extracting out our consensus engine.

  Code-wise, this PR:
  1. Extracts `AppInitMain`'s Chainstate loading sequence into a `::LoadChainstateSequence` function
  2. Makes this `::LoadChainstateSequence` function reusable by
      1. Decoupling it from various concepts (`ArgsManager`, `uiInterface`, etc)
      2. Making it report errors using an `enum` rather than by setting a `bilingual_str`
  3. Makes `*TestingSetup` use this new `::LoadChainstateSequence`

  Reviewers: Aside from commentary, I've also included `git diff` flags of interest in the commit messages which I hope will aid review!

ACKs for top commit:
  ryanofsky:
    Code review ACK 7f15eff2ddd86034e84a19413e1a42883987f660. Thanks for updates!
  MarcoFalke:
    review ACK 7f15eff2ddd86034e84a19413e1a42883987f66 💳

Tree-SHA512: fb9a6cbd1c511a52b477c62a5e68e53a8be5dec2fff0e44a279966afb91efbab44bf1fe7c6b1519f8464ecc25f42dd4bae8e1efbf55ee91fc90fa0b92e3a83e2

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