Add `JobContinuationOptions.OnlyOnFailedState`

Please add `JobContinuationOptions.OnlyOnFailedState`.
I want to be able to perform some action when parent job failed (after n retries).

```
BackgroundJob.ContinueJobWith(string parentId, Action action, JobContinuationOptions.OnlyOnFailedState)
```

Could be also named `ContinueFailedJobWith`

Start by locating JobContinuationOptions and the ContinueJobWith entry point named in the issue, then inspect how continuation states and retries are handled. Confirm the intended behavior for a parent that ultimately fails, including the proposed API name, and add coverage showing that the continuation runs only after final failure.

Written by the indexing model from the issue text.