Ignore error if mentioned account was not processable (#29215)

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

app/workers/mention_resolve_worker.rb

@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+class MentionResolveWorker
+  include Sidekiq::Worker
+  include ExponentialBackoff
+  include JsonLdHelper
+
+  sidekiq_options queue: 'pull', retry: 7
+
+  def perform(status_id, uri, options = {})
+    status = Status.find_by(id: status_id)
+    return if status.nil?
+
+    account = account_from_uri(uri)
+    account = ActivityPub::FetchRemoteAccountService.new.call(uri, request_id: options[:request_id]) if account.nil?
+
+    return if account.nil?
+
+    status.mentions.create!(account: account, silent: false)
+  rescue ActiveRecord::RecordNotFound
+    # Do nothing
+  rescue Mastodon::UnexpectedResponseError => e
+    response = e.response
+
+    if response_error_unsalvageable?(response)
+      # Give up
+    else
+      raise e
+    end
+  end
+
+  private
+
+  def account_from_uri(uri)
+    ActivityPub::TagManager.instance.uri_to_resource(uri, Account)
+  end
+end