record last observed payout address for a user, which will support some data gathering im doing

[owocki]

Description

record last observed payout address for a user, which will support some data gathering im doing

Refers/Fixes

refers a kevin DM convo on twitter

Testing

tested locally

[codecov]

Codecov Report

Merging #7775 into master will increase coverage by 0.39%.
The diff coverage is 40.00%.

@@            Coverage Diff             @@
##           master    #7775      +/-   ##
==========================================
+ Coverage   25.42%   25.81%   +0.39%     
==========================================
  Files         328      328              
  Lines       33044    33639     +595     
  Branches     4919     5084     +165     
==========================================
+ Hits         8401     8685     +284     
- Misses      24356    24639     +283     
- Partials      287      315      +28     

Impacted Files	Coverage Δ
app/marketing/management/commands/post_data.py	0.00% <0.00%> (ø)
app/dashboard/models.py	51.63% <50.00%> (+1.62%)	⬆️
app/quests/views.py	16.22% <0.00%> (ø)
app/dashboard/views.py	10.35% <0.00%> (ø)
...rketing/management/commands/no_applicants_email.py	0.00% <0.00%> (ø)
...eting/management/commands/assemble_leaderboards.py	39.73% <0.00%> (ø)
app/marketing/mails.py	13.56% <0.00%> (+1.67%)	⬆️
app/retail/emails.py	22.92% <0.00%> (+2.48%)	⬆️

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