Add callback to ask online validation confirmation #997

Job	Run time
Run Coverity tests	0s
Build on Fedora to fedora:37	3m 18s
Build on macOS for osx	7m 9s
Build on Fedora to fedora:38	3m 8s
Build on macOS for ios	5m 3s
Run CodeQL tests	9m 1s
Deploy pages	0s
Build on macOS for iossimulator	4m 59s
Build on Ubuntu to ubuntu:20.04	3m 43s
Build on macOS for androidarm	2m 40s
Build on Windows (143)	1h 32m 42s
Build on Ubuntu to ubuntu:22.04	6m 5s
Build on Ubuntu to ubuntu:23.04	5m 59s
Build on Windows (142)	1h 19m 40s
Build on macOS for androidarm64	3m 39s
Build on Ubuntu to ubuntu:23.10	6m 51s
Build on macOS for androidx86_64	3m 40s
	3h 57m 37s

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