Improve error handling on LinkCrawlWorker (#5250)

* Improve error handling on LinkCrawlWorker

* Ignore TimeoutError and InvalidURIError too
* Record errors to debug log
* Enable dead job queue on LinkCrawlWorker

Since most of acceptable errors were already ignored, only our side issue should go to dead job queue.

* Ignore all http gem errors

app/services/fetch_link_card_service.rb

@@ -27,7 +27,8 @@ class FetchLinkCardService < BaseService
     end
 
     attach_card if @card&.persisted?
-  rescue HTTP::ConnectionError, OpenSSL::SSL::SSLError
+  rescue HTTP::Error, Addressable::URI::InvalidURIError => e
+    Rails.logger.debug "Error fetching link #{@url}: #{e}"
     nil
   end
 

app/workers/link_crawl_worker.rb

@@ -3,7 +3,7 @@
 class LinkCrawlWorker
   include Sidekiq::Worker
 
-  sidekiq_options queue: 'pull', retry: false
+  sidekiq_options queue: 'pull', retry: 0
 
   def perform(status_id)
     FetchLinkCardService.new.call(Status.find(status_id))