Add users.policies_acknowledged_at

[segiddins]

So we can track when users last acked the policies, and prompt them to do so when we introduce/update them

Signed-off-by: Samuel Giddins segiddins@segiddins.me

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.15%. Comparing base (c578757) to head (4269877).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5530   +/-   ##
=======================================
  Coverage   97.15%   97.15%           
=======================================
  Files         460      460           
  Lines        9552     9559    +7     
=======================================
+ Hits         9280     9287    +7     
  Misses        272      272           

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[simi]

@mghaught would you mind to update what's the last take on this? How this approval is going to be collected?

[colby-swandale]

@simi as per the email:

we will display a banner on RubyGems.org prompting users to review and accept the new policies.

I'm going to add this functionality into a separate PR