add test to detect celery/pyramid-registry problematic resolution

[fmigneault]

To Do

• patch get_registry and relevant methods such that test succeeds
• validate against running / live server where issue was observed (@perronld)
• extend test for more cases if not resolved entirely
• update changelog

References

• Closes Woraround for registry resolving when restarting celery prefork workers #589
  (once actually fixed)

[fmigneault]

@perronld Just need a counter validation to make sure I didn't reintroduce the problem.

[perronld]

Tested in staging, works perfectly!

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (2752c63) 85.17% compared to head (bb8cdb4) 85.17%.

Files	Patch %	Lines
weaver/__init__.py	0.00%	2 Missing ⚠️
weaver/utils.py	81.81%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #590   +/-   ##
=======================================
  Coverage   85.17%   85.17%           
=======================================
  Files          79       79           
  Lines       18023    18035   +12     
  Branches     2728     2731    +3     
=======================================
+ Hits        15351    15362   +11     
- Misses       1941     1942    +1     
  Partials      731      731           

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