Fix to be able to redownload avatar and header (#16190)

* Fix to reset if header and avatar download fails

* Add RedownloadAvatarWorker and RedownloadHeaderWorker

app/workers/redownload_header_worker.rb

@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+class RedownloadHeaderWorker
+  include Sidekiq::Worker
+  include ExponentialBackoff
+  include JsonLdHelper
+
+  sidekiq_options queue: 'pull', retry: 7
+
+  def perform(id)
+    account = Account.find(id)
+
+    return if account.suspended? || DomainBlock.rule_for(account.domain)&.reject_media?
+    return if account.header_remote_url.blank? || account.header_file_name.present?
+
+    account.reset_header!
+    account.save!
+  rescue ActiveRecord::RecordNotFound
+    # Do nothing
+  rescue Mastodon::UnexpectedResponseError => e
+    response = e.response
+
+    if response_error_unsalvageable?(response)
+      # Give up
+    else
+      raise e
+    end
+  end
+end