If an async provider fails, call ProviderObserver.providerDidFail (#3… #4696

Job	Run time
build (stable, examples/counter)	1m 36s
build (stable, examples/marvel)	50s
build (stable, examples/pub)	1m 8s
build (stable, examples/random_number)	54s
build (stable, examples/stackoverflow)	51s
build (stable, examples/todos)	1m 11s
build (stable, packages/riverpod)	3m 20s
build (stable, packages/riverpod/example)	1m 5s
build (stable, packages/flutter_riverpod)	1m 29s
build (stable, packages/flutter_riverpod/example)	1m 17s
build (stable, packages/hooks_riverpod)	1m 19s
build (stable, packages/hooks_riverpod/example)	1m 10s
build (stable, packages/riverpod_annotation)	1m 1s
build (stable, packages/riverpod_generator)	1m 57s
build (stable, packages/riverpod_generator/integration/build_yaml)	2m 10s
build (stable, website)	55s
build (master, examples/counter)	1m 36s
build (master, examples/marvel)	1m 20s
build (master, examples/pub)	1m 21s
build (master, examples/random_number)	1m 45s
build (master, examples/stackoverflow)	1m 47s
build (master, examples/todos)	1m 29s
build (master, packages/riverpod)	3m 32s
build (master, packages/riverpod/example)	1m 25s
build (master, packages/flutter_riverpod)	2m 15s
build (master, packages/flutter_riverpod/example)	1m 30s
build (master, packages/hooks_riverpod)	1m 32s
build (master, packages/hooks_riverpod/example)	2m 10s
build (master, packages/riverpod_annotation)	1m 10s
build (master, packages/riverpod_generator)	2m 27s
build (master, packages/riverpod_generator/integration/build_yaml)	2m 11s
build (master, website)	2m 3s
	51m 46s

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