MINIFICPP-2489 Send reason for rejecting flow update #5691

Job	Run time
macos-xcode	35m 18s
rocky	41m 54s
Docker build for integration tests	48m 23s
ubuntu-22.04-clang	1h 17m 59s
ubuntu-24.04	27m 58s
windows-2022	1h 20m 24s
Docker integration tests	20m 57s
	5h 32m 53s

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