Add samples generations to notifications

[KSadomtsev]

It could take some time to generate a sample, in some cases, it would be useful

[chrisknoll]

Not a bugfix, so please assign this for 2.10, not 2.9.

[KSadomtsev]

Not a bugfix, so please assign this for 2.10, not 2.9.

sure

[chrisknoll]

Ok, to be clear: the samples are being generated via jobs, but the issue here is that we don't see a notification when the job is complete? I am not too familiar anymore about the special behavior of notifications, i thought notifications and job status were connected.

If this is something we want to implement, can we give a brief summary here of what changes would be required? Is this a simple call to an API function after job completion to add a notification, or do we need to extend a class structure for cohort samples to support notifications?