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Maximilian Köller 0dc45446fe feat(service-worker): expose more version update events (#43668 )

This commit introduces a new `SwUpdate#versionUpdates` observalbe, which provides more granular
information about Service Worker version updates than the already existing `SwUpdate#available`
observable.

The new events emitted by `SwUpdate#versionUpdates` basically add the possibility for application to
get notified if a new version is available on the server (not yet downloaded) and if an installation
of a new version failed.

Closes #39840

DEPRECATED: The `SwUpdate#availalbe` observable is deprecated.

The new `SwUpdate#versionUpdates` observable provides the same information and more. Therefore, it
is possible to rebuild the same behavior as `SwUpdate#availalbe` using the events emitted by
`SwUpdate#versionUpdates` and filtering for `VersionReadyEvent` events.
As a result, the `SwUpdate#availalbe` observable is now redundant.

PR Close #43668

2021-10-05 11:00:07 -07:00