Read Sift moderation whitelist from environment

[gzurowski]

Remove list of hard-coded Sift moderators (user IDs) and read whitelist from the environment (SIFT_MODERATION_WHITELIST) instead.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 65.40%. Comparing base (66f9e5d) to head (1b23908).

Files with missing lines	Patch %	Lines
src/user/views/user_views.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2018      +/-   ##
==========================================
- Coverage   65.40%   65.40%   -0.01%     
==========================================
  Files         417      417              
  Lines       23809    23809              
==========================================
- Hits        15573    15572       -1     
- Misses       8236     8237       +1     

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