Add support for markers in description

pr_agent/settings/configuration.toml

@@ -25,9 +25,12 @@ automatic_review=true
 extra_instructions = ""
 
 [pr_description] # /describe #
+publish_labels=true
 publish_description_as_comment=false
 add_original_user_description=false
 keep_original_user_title=false
+use_description_markers=false
+include_generated_by_header=true
 extra_instructions = ""
 
 [pr_questions] # /ask #