Add poststorage child workflows

[jraddaoui]

Allow to configure a set of poststorage child workflows that will be
started after AIP storage. These workflows will receive the AIPUUID
as a parameter and the parent workflow will only wait for them to be
started by Temporal. They are started with a disconnected context and
using the abandon parent close policy, so they can continue running
after the parent workflow finishes, therefore their results are ignored.

Refs #886.

[djjuhasz]

Thanks @jraddaoui. I had a couple of thoughts, but one doesn't require any changes. I think you need to address what happens if the poststorage workflow is called with an a3m vs. AM preservation system.

[jraddaoui]

Yes, if a child workflow only works with AM and Enduro is configured to run with a3m, I'd prefer that child workflow to fail to know I misconfigured the system.

As I said, we may want to improve that at some point to be able to report the child workflows in the API/UI. For now they are just like webhooks to be able to trigger custom workflows after storage, and we only make sure those workflows are started by Temporal. Those workflows can be monitored elsewhere for now, until we decide if we want to add information about them in the API/UI.

I'll add some tests and ping you for a final review.

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 54.74%. Comparing base (92feb35) to head (a8191df).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/workflow/processing.go	80.00%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1061      +/-   ##
==========================================
+ Coverage   54.55%   54.74%   +0.19%     
==========================================
  Files         103      104       +1     
  Lines        7512     7632     +120     
==========================================
+ Hits         4098     4178      +80     
- Misses       3164     3198      +34     
- Partials      250      256       +6     

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[djjuhasz]

LGTM 👍