If an async provider fails, call ProviderObserver.providerDidFail #4695

Job	Run time
build (stable, examples/counter)	1m 25s
build (stable, examples/marvel)	58s
build (stable, examples/pub)	1m 1s
build (stable, examples/random_number)	57s
build (stable, examples/stackoverflow)	1m 1s
build (stable, examples/todos)	1m 30s
build (stable, packages/riverpod)	3m 36s
build (stable, packages/riverpod/example)	58s
build (stable, packages/flutter_riverpod)	1m 36s
build (stable, packages/flutter_riverpod/example)	1m 10s
build (stable, packages/hooks_riverpod)	1m 11s
build (stable, packages/hooks_riverpod/example)	1m 16s
build (stable, packages/riverpod_annotation)	1m 1s
build (stable, packages/riverpod_generator)	1m 52s
build (stable, packages/riverpod_generator/integration/build_yaml)	2m 23s
build (stable, website)	1m 5s
build (master, examples/counter)	2m 11s
build (master, examples/marvel)	1m 20s
build (master, examples/pub)	1m 22s
build (master, examples/random_number)	1m 13s
build (master, examples/stackoverflow)	4m 15s
build (master, examples/todos)	1m 58s
build (master, packages/riverpod)	4m 10s
build (master, packages/riverpod/example)	1m 8s
build (master, packages/flutter_riverpod)	5m 0s
build (master, packages/flutter_riverpod/example)	1m 48s
build (master, packages/hooks_riverpod)	1m 34s
build (master, packages/hooks_riverpod/example)	1m 28s
build (master, packages/riverpod_annotation)	1m 7s
build (master, packages/riverpod_generator)	1m 56s
build (master, packages/riverpod_generator/integration/build_yaml)	1m 58s
build (master, website)	1m 28s
	56m 56s

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