multi-peer orphan resolution followups
Followup to #31397.
Addressing (in order): https://github.com/bitcoin/bitcoin/pull/31397#discussion_r1906077380 https://github.com/bitcoin/bitcoin/pull/31397#discussion_r1881060842 https://github.com/bitcoin/bitcoin/pull/31397#discussion_r1905994963 https://github.com/bitcoin/bitcoin/pull/31397#discussion_r1905999581 https://github.com/bitcoin/bitcoin/pull/31397#discussion_r1906001592 https://github.com/bitcoin/bitcoin/pull/31397#discussion_r1905989913 https://github.com/bitcoin/bitcoin/pull/31397#discussion_r1905920861 https://github.com/bitcoin/bitcoin/pull/31658#pullrequestreview-2551617694 https://github.com/bitcoin/bitcoin/pull/31397#discussion_r1917559601