Fix TypeError when resuming process through the callback endpoint

[Haak1981]

Getting a TypeError: _celery_resume_process() missing 2 required keyword-only arguments: 'user_inputs' and 'user'. Scenario is when using callback in combination with Celery. When using threadpool execution context the issue is not seen as there a default (None) is set.

[codspeed-hq]

CodSpeed Performance Report

Merging #948 will not alter performance

_{Comparing Haak1981:patch-1 (a47f1ad) with main (ebbeb34)}

Summary

✅ 12 untouched benchmarks

[pboers1988]

LGTM

[Mark90]

Looks correct to me, continue_awaiting_process indeed doesn't have these variables to pass along.

Thanks for taking the time to dig into this :)