[Draft] Feature/1206 failed notif email

[stevenbal]

Fixes: open-zaak/open-zaak#1206

TODO:

• Implement cooldown period
• Implement [Draft] ✨ Add config option for recipients for failed notif emails VNG-Realisatie/vng-api-common#204 in notifications API common
• better email template
• configurable DEFAULT_FROM_EMAIL?

[codecov-commenter]

Codecov Report

❌ Patch coverage is 94.25287% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.01%. Comparing base (dc18f57) to head (c52cb8c).

Files with missing lines	Patch %	Lines
src/nrc/api/tasks.py	88.09%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@                        Coverage Diff                        @@
##           feature/1203-env-config-admin      #73      +/-   ##
=================================================================
+ Coverage                          88.72%   89.01%   +0.28%     
=================================================================
  Files                                 82       82              
  Lines                               2004     2084      +80     
  Branches                             214      217       +3     
=================================================================
+ Hits                                1778     1855      +77     
- Misses                               197      199       +2     
- Partials                              29       30       +1     

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