Bitcoin state poller: a bug fix and a few RBF handling improvements #1502

Job	Run time
linter_gui	5m 18s
linter	33s
unit_tests (1.54, ubuntu-latest)	5m 9s
unit_tests (1.54, macOS-latest)	9m 18s
unit_tests (1.54, windows-latest)	6m 36s
unit_tests (nightly, ubuntu-latest)	57s
unit_tests (nightly, macOS-latest)	1m 33s
unit_tests (nightly, windows-latest)	1m 56s
unit_tests_gui (1.65, ubuntu-latest)	6m 39s
unit_tests_gui (1.65, macOS-latest)	13m 9s
unit_tests_gui (1.65, windows-latest)	8m 38s
unit_tests_gui (nightly, ubuntu-latest)	2m 31s
unit_tests_gui (nightly, macOS-latest)	3m 16s
unit_tests_gui (nightly, windows-latest)	4m 26s
	1h 9m 59s

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