Add rake task to rerun failed account deletions

closes #7639

Changelog.md

 # 0.7.1.0
 
+## Ensure account deletions are run
+
+There were some issues causing accounts deletions to not properly perform in some cases, see
+[#7631](https://github.com/diaspora/diaspora/issues/7631) and [#7639](https://github.com/diaspora/diaspora/pull/7639).
+To ensure these are reexecuted properly, please run `RAILS_ENV=production bin/rake migrations:run_account_deletions`
+after you've upgraded.
+
 ## Refactor
 * Remove title from profile photo upload button [#7551](https://github.com/diaspora/diaspora/pull/7551)
 * Remove Internet Explorer workarounds [#7557](https://github.com/diaspora/diaspora/pull/7557)
@@ -14,6 +21,7 @@
 * Remove `rails_admin_histories` table [#7597](https://github.com/diaspora/diaspora/pull/7597)
 * Optimize memory usage on profile export [#7627](https://github.com/diaspora/diaspora/pull/7627)
 * Limit the number of parallel exports [#7629](https://github.com/diaspora/diaspora/pull/7629)
+* Reduce memory usage for account deletion [#7639](https://github.com/diaspora/diaspora/pull/7639)
 
 ## Bug fixes
 * Fix displaying polls with long answers [#7579](https://github.com/diaspora/diaspora/pull/7579)
@@ -29,6 +37,7 @@
 * Delete invalid diaspora IDs from friendica [#7630](https://github.com/diaspora/diaspora/pull/7630)
 * Cleanup relayables where the signature is missing [#7637](https://github.com/diaspora/diaspora/pull/7637)
 * Avoid page to jump to top after a post deletion [#7638](https://github.com/diaspora/diaspora/pull/7638)
+* Handle duplicate account deletions [#7639](https://github.com/diaspora/diaspora/pull/7639)
 
 ## Features
 * Ask for confirmation when leaving a submittable comment field [#7530](https://github.com/diaspora/diaspora/pull/7530)

lib/tasks/migrations.rake

@@ -59,4 +59,15 @@ namespace :migrations do
       queue.clear
     end
   end
+
+  desc "Run uncompleted account deletions"
+  task run_account_deletions: :environment do
+    if AccountDeletion.uncompleted.count > 0
+      puts "Running account deletions.."
+      AccountDeletion.uncompleted.find_each(&:perform!)
+      puts "OK."
+    else
+      puts "No acccount deletions to run."
+    end
+  end
 end