Add logger and custom errors for epic syncing

What does this MR do and why?

This refactors the SyncAsWorkItem concern and adds a SyncAsWorkItemError to easily filter epic to work item syncing errors. In addition, we added a custom logger for errors that could happen when an epic gets synced as a work item and fixes an issue for reporting the wrong error messages.

This also tackles #439895 (closed)

MR acceptance checklist

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Before	After

How to set up and validate locally

1. Apply the following patch to let the Work item update or creation fail:
2. Go to epics and create one
3. Check the log for the errors
4. If you don't have a synced work item epic yet, go to SyncAsWorkItem concern and remove the create_params[:title] = nil line we added with the patch to get a successful creation
5. Go to an epic with a synced work item and update it
6. Check the logs for the errors

How to check logs

tail -f  log/epic_work_item_sync.log

Patch to apply to create failures

diff --git a/ee/app/services/concerns/epics/sync_as_work_item.rb b/ee/app/services/concerns/epics/sync_as_work_item.rb
index f9822034f2f2..7ffe8ff3f151 100644
--- a/ee/app/services/concerns/epics/sync_as_work_item.rb
+++ b/ee/app/services/concerns/epics/sync_as_work_item.rb
@@ -53,6 +53,7 @@ def create_params(epic)
 
       create_params[:title_html] = epic.title_html if params[:title].present?
       create_params[:description_html] = epic.description_html if params[:description].present?
+      create_params[:title] = nil
 
       create_params
     end
@@ -68,6 +69,7 @@ def update_params(epic)
 
       update_params[:title_html] = epic.title_html if params[:title].present?
       update_params[:description_html] = epic.description_html if params[:description].present?
+      update_params[:title] = nil
 
       update_params
     end