backport: Merge bitcoin#29404, 28144, 28118#7124

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vijaydasmp wants to merge 3 commits intodashpay:developfrom

vijaydasmp:Feb_2026_04

Commits on Feb 25, 2026

Merge bitcoin/bitcoin#29404: refactor: bitcoin-config.h includes cleanup

fanquake
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vijaydasmp
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Merge bitcoin/bitcoin#28144: test: fix intermittent failure in p2p_getaddr_caching.py

fanquake
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vijaydasmp
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Merge bitcoin/bitcoin#28118: test: Add SyncWithValidationInterfaceQueue to mockscheduler RPC

fanquake
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vijaydasmp
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