Use trySolution with assert for FJ result (instead of addIncumbent). … #2426

Job	Run time
debug (macos-latest)	18m 37s
debug_all_tests (macos-latest)	21m 48s
debug64 (macos-latest)	18m 37s
debug64_all_tests (macos-latest)	9m 47s
release_all_tests (macos-latest)	8m 10s
release (macos-latest)	7m 45s
Release64 (macos-latest)	18m 21s
Release64_all_tests (macos-latest)	12m 29s
	1h 55m 34s

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