feat: Newsletter subscription for new and old users

[makseq]

No description provided.

[codecov]

Codecov Report

Merging #2511 (a2a1437) into develop (17b40da) will decrease coverage by 0.35%.
The diff coverage is n/a.

❗ Current head a2a1437 differs from pull request most recent head bb22fae. Consider uploading reports for the commit bb22fae to get more accurate results

@@             Coverage Diff             @@
##           develop    #2511      +/-   ##
===========================================
- Coverage    77.80%   77.44%   -0.36%     
===========================================
  Files          137      141       +4     
  Lines         9951    10257     +306     
===========================================
+ Hits          7742     7944     +202     
- Misses        2209     2313     +104     

Impacted Files	Coverage Δ
label_studio/label_studio/users/mixins.py	75.00% <0.00%> (-12.50%)	⬇️
...bel_studio/label_studio/organizations/functions.py	66.66% <0.00%> (-10.26%)	⬇️
label_studio/label_studio/tasks/serializers.py	84.27% <0.00%> (-2.27%)	⬇️
label_studio/label_studio/tasks/models.py	87.85% <0.00%> (-2.20%)	⬇️
...abel_studio/label_studio/data_manager/functions.py	64.70% <0.00%> (-1.97%)	⬇️
label_studio/label_studio/core/label_config.py	71.54% <0.00%> (-1.85%)	⬇️
label_studio/label_studio/users/forms.py	87.87% <0.00%> (-1.60%)	⬇️
label_studio/label_studio/data_manager/managers.py	80.17% <0.00%> (-1.54%)	⬇️
.../label_studio/data_manager/actions/experimental.py	18.62% <0.00%> (-0.89%)	⬇️
label_studio/label_studio/core/redis.py	43.33% <0.00%> (-0.74%)	⬇️
... and 36 more

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