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7b5d256af4test: Add bitcoin-chainstate test for assumeutxo functionality (stringintech)2bc3265649Fix `ChainstateManager::AddChainstate()` assertion crash (stringintech)5f3d6bdb66Add regtest support to bitcoin-chainstate tool (stringintech) Pull request description: This PR adds functional test coverage for the bitcoin-chainstate tool loading a datadir initialized with an assumeutxo snapshot. The PR also includes: - Fix for assertion crash in `ChainstateManager::AddChainstate()` when `prev_chainstate` has no initialized mempool (required for the test to pass) - `-regtest` flag support for bitcoin-chainstate to enable the testing This work started while experimenting with the bitcoin-chainstate tool and how the kernel API (#30595) behaved when loading a datadir containing assumeutxo data, during the time that PR was still under review. sedited suggested opening a PR to add this test coverage. ACKs for top commit: achow101: ACK7b5d256af4theStack: Concept and code-review ACK7b5d256af4sedited: Re-ACK7b5d256af4Tree-SHA512: 5d3b0050cf2d53144b5f65451c991d5e212117b4541ae1368ecf58fde5f3cca4f018aad6ae32257b9ebb1c28b926424fbcff496ba5487cdc4eb456cea6db8b24