[API-42282] Improve error handling and logging for POA dependent assignment

[tycol7]

Summary

Update the POA dependent assignment service to more robustly handle errors and log more meaningful messages.

• Add POA ID to logs.
• Do not fall back to update_benefit_claim? if manage_ptcpnt_rlnshp? fails unexpectedly; instead, raise an error.

Related issue(s)

API-42282

Testing done

• Manual calls to BGS.

Screenshots

N/A

What areas of the site does it impact?

Dependent claimant POA assignment service.

Acceptance criteria

• I fixed|updated|added unit tests and integration tests for each feature (if applicable).
• No error nor warning in the console.
• Events are being sent to the appropriate logging solution
• Documentation has been updated (link to documentation)
• No sensitive information (i.e. PII/credentials/internal URLs/etc.) is captured in logging, hardcoded, or specs
• Feature/bug has a monitor built into Datadog (if applicable)
• If app impacted requires authentication, did you login to a local build and verify all authenticated routes work as expected
• I added a screenshot of the developed feature

Requested Feedback

N/A

[rockwellwindsor-va]

looking good. Including screenshots of the log output just to double check that everything looks as you expected, it looked like what I would have expected.

• Failing to assign log out

* What we will see in sidekiq on this one 

• Something else went wrong log out

[rockwellwindsor-va]

Everything looked solid, once again including screenshots just to make sure it matches what you had in mind. Error generated was quite forced so might not be best example.