Fix AsyncValidationCE binding against asyncResult #843

Job	Run time
build-devcontainer	9m 2s
dotnet-build (Debug, ubuntu-latest)	3m 30s
fable-python-build (ubuntu-latest, 3.10)	2m 38s
dotnet-build (Debug, windows-latest)	6m 19s
fable-npm-build (ubuntu-latest, 18)	1m 58s
fable-python-build (ubuntu-latest, 3.11)	3m 1s
dotnet-build (Debug, macOS-latest)	3m 38s
fable-npm-build (ubuntu-latest, 20)	2m 23s
fable-python-build (ubuntu-latest, 3.12)	2m 59s
fable-npm-build (ubuntu-latest, latest)	2m 17s
dotnet-build (Release, ubuntu-latest)	3m 14s
fable-python-build (windows-latest, 3.10)	6m 8s
fable-npm-build (windows-latest, 18)	5m 50s
dotnet-build (Release, windows-latest)	5m 5s
fable-python-build (windows-latest, 3.11)	6m 12s
fable-npm-build (windows-latest, 20)	6m 40s
dotnet-build (Release, macOS-latest)	3m 8s
fable-python-build (windows-latest, 3.12)	5m 7s
fable-npm-build (windows-latest, latest)	5m 53s
fable-python-build (macOS-latest, 3.10)	2m 54s
fable-python-build (macOS-latest, 3.11)	2m 18s
fable-npm-build (macOS-latest, 18)	1m 50s
fable-python-build (macOS-latest, 3.12)	2m 7s
fable-npm-build (macOS-latest, 20)	2m 4s
fable-npm-build (macOS-latest, latest)	2m 1s
	1h 38m 16s

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