Included tag form last cohort on email marketing domain

[renzon]

close #3790

[codecov]

Codecov Report

Merging #3791 (81407be) into master (1193314) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3791   +/-   ##
=======================================
  Coverage   95.73%   95.73%           
=======================================
  Files         239      240    +1     
  Lines        6888     6896    +8     
=======================================
+ Hits         6594     6602    +8     
  Misses        294      294           

Impacted Files	Coverage Δ
pythonpro/domain/subscription_domain.py	81.13% <100.00%> (+1.13%)	⬆️
...007_allow_subscripiton_be_saved_without_payment.py	100.00% <100.00%> (ø)
pythonpro/memberkit/models.py	95.55% <100.00%> (ø)

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