Record account suspend/silence time and keep track of domain blocks (#10660)

* Record account suspend/silence time and keep track of domain blocks

* Also unblock users who were suspended/silenced before dates were recorded

* Add tests

* Keep track of suspending date for users suspended through the CLI

* Show accurate number of accounts that would be affected by unsuspending an instance

* Change migration to set silenced_at and suspended_at

* Revert "Also unblock users who were suspended/silenced before dates were recorded"

This reverts commit a015c65d2d1e28c7b7cfab8b3f8cd5fb48b8b71c.

* Switch from using suspended and silenced to suspended_at and silenced_at

* Add post-deployment migration script to remove `suspended` and `silenced` columns

* Use Account#silence! and Account#suspend! instead of updating the underlying property

* Add silenced_at and suspended_at migration to post-migration

* Change account fabricator to translate suspended and silenced attributes

* Minor fixes

* Make unblocking domains always retroactive

app/views/admin/domain_blocks/show.html.haml

@@ -3,18 +3,11 @@
 
 = simple_form_for @domain_block, url: admin_domain_block_path(@domain_block), method: :delete do |f|
 
-  - if (@domain_block.noop?)
-    = f.input :retroactive,
-      as: :hidden,
-      input_html: { :value => "0" }
-  - else
-    = f.input :retroactive,
-      as: :boolean,
-      wrapper: :with_label,
-      label: t(".retroactive.#{@domain_block.severity}"),
-      hint: t(:affected_accounts,
-        scope: [:admin, :domain_blocks, :show],
-        count: @domain_block.accounts_count)
+  - unless (@domain_block.noop?)
+    %p= t(".retroactive.#{@domain_block.severity}")
+    %p.hint= t(:affected_accounts,
+      scope: [:admin, :domain_blocks, :show],
+      count: @domain_block.affected_accounts_count)
 
   .actions
     = f.button :button, t('.undo'), type: :submit