fa86710187 Clarify that CheckSequenceLocksAtTip is a validation function (MarcoFalke)
Pull request description:
It has been pointed out that a bug in this function can prevent block template creation. ( https://github.com/bitcoin/bitcoin/pull/24080#issuecomment-1065148776 ) So it seems that the scope of this function is more than "policy". Rename it back to "validation", to partially revert commit fa4e30b0f3.
ACKs for top commit:
ajtowns:
ACK fa86710187 - looks fine to me
glozow:
ACK fa86710187
Tree-SHA512: 2e0df8c70df4cbea857977f140a8616cfa7505e74df66c9c9fbcf184670ce3ce7567183c3f76e6f3fe8ca6de0e065b9babde6352d6cb495e71ea077ddedbc3f4