Notify authority when problems are detected in spreadsheet releases

[garethrees]

Requires #8047.

Once we’ve identified a problem we’ll notify the authority with an automated email. We’ll want to be specific about the problems we’ve detected and what that means. I’m imagining we’ll have a partial that explains each problem, and for any automated email we just include the partials relevant to the given attachment.

# foi_attachment.warnings
# => [:hidden_columns, :pivot_table_cache]

<%= foi_attachment.warnings.each do |warning|
  <%= render partial: “warnings/#{warning}” %>
<% end %>

The notification should link to an appropriate place to report the issue (maybe “report this request” by default, but we’ll probably want to customise that in WhatDoTheyKnow to point at our data breach form).