gui: Add automated coin selection for spend #1498

Job	Run time
linter_gui	5m 54s
linter	35s
unit_tests (1.54, ubuntu-latest)	4m 55s
unit_tests (1.54, macOS-latest)	14m 27s
unit_tests (1.54, windows-latest)	6m 35s
unit_tests (nightly, ubuntu-latest)	57s
unit_tests (nightly, macOS-latest)	2m 26s
unit_tests (nightly, windows-latest)	1m 44s
unit_tests_gui (1.65, ubuntu-latest)	6m 31s
unit_tests_gui (1.65, macOS-latest)	11m 7s
unit_tests_gui (1.65, windows-latest)	9m 17s
unit_tests_gui (nightly, ubuntu-latest)	2m 35s
unit_tests_gui (nightly, macOS-latest)	3m 58s
unit_tests_gui (nightly, windows-latest)	4m 2s
	1h 15m 3s

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