backport: Merge bitcoin#28787, 23083#7031

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vijaydasmp wants to merge 2 commits intodashpay:developfrom

vijaydasmp:Dec_2025_1

Commits on Dec 20, 2025

Merge bitcoin/bitcoin#28787: init: completely remove `-zapwallettxes` (remaining hidden option)

achow101
authored and
vijaydasmp
committed
Merge bitcoin/bitcoin#23083: rpc: Fail to return undocumented or misdocumented JSON

fanquake
authored and
vijaydasmp
committed