Change Details

Notes: - `InvalidChainFound` was already moved to `CChainState` in D7573 - `CheckForkWarningConditionsOnNewFork` was removed by core in core#19905 because it doesn't work, but in Bitcoin ABC it was fixed in D1950. This is a backport of core#21055 [8/16] https://github.com/bitcoin/bitcoin/pull/21055/commits/8b99efbcc08ab41caf657c6d730a27e6a91bc356

Notes: - `InvalidChainFound` was already moved to `CChainState` in D7573 - `CheckForkWarningConditionsOnNewFork` was removed by core in [[https://github.com/bitcoin/bitcoin/pull/19905 | core#19905]] because it doesn't work, but in Bitcoin ABC it was fixed in D1950. This is a backport of [[https://github.com/bitcoin/bitcoin/pull/21055 | core#21055]] [8/16] https://github.com/bitcoin/bitcoin/pull/21055/commits/8b99efbcc08ab41caf657c6d730a27e6a91bc356

Notes: - `InvalidChainFound` was already moved to `CChainState` in D7573 - `CheckForkWarningConditionsOnNewFork` was removed by core in [[https://github.com/bitcoin/bitcoin/pull/19905 | core#19905]] because it doesn't work, but in Bitcoin ABC it was fixed in D1950. This is a backport of [[https://github.com/bitcoin/bitcoin/pull/21055 | core#21055]] [8/16] https://github.com/bitcoin/bitcoin/pull/21055/commits/8b99efbcc08ab41caf657c6d730a27e6a91bc356