Merge bitcoin/bitcoin#30880: test: Wait for local services to update in feature_assumeutxo

19f4a7c95a99162122068d4badffeea240967a65 test: Wait for local services to update in feature_assumeutxo (Fabian Jahr)

Pull request description:

  Closes #30878

  It seems like there is a race where the block is stored locally and `getblock` does not error anymore, but `ActivateBestChain` has not finished yet, so the local services are not updated yet either. Fix this by waiting for the local services to update.

  Can be reproduced locally by adding the sleep here:

  ```cpp
  ──────────────────────────────────────────────────────────────────────────────────────────────────────────┐
  src/validation.cpp:3567: bool Chainstate::ActivateBestChain(BlockValidationState& state, std::shared_ptr< │
  ──────────────────────────────────────────────────────────────────────────────────────────────────────────┘
          }

          if (WITH_LOCK(::cs_main, return m_disabled)) {
              std::this_thread::sleep_for(std::chrono::seconds(10));
              // Background chainstate has reached the snapshot base block, so exit.

              // Restart indexes to resume indexing for all blocks unique to the snapshot
  ```

ACKs for top commit:
  maflcko:
    review-only ACK 19f4a7c95a99162122068d4badffeea240967a65
  achow101:
    ACK 19f4a7c95a99162122068d4badffeea240967a65
  pablomartin4btc:
    tACK 19f4a7c95a99162122068d4badffeea240967a65
  furszy:
    Code review ACK [19f4a7c](https://github.com/bitcoin/bitcoin/pull/30880/commits/19f4a7c95a99162122068d4badffeea240967a65).

Tree-SHA512: 70dad3795988956c5e20f2d2d895fb56c5e3ce257c7547d3fd729c88949f0e24cb34594da1537bce8794ad02b2db44e7e46e995aa32539cd4dd84c4f1d4bb1c4

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