New resource reader capabilities

What does this MR do and why?

This MR retires using SummarizeComments tool from usage in chat. Instead, I have added comments to the serialized issue. This way, LLM has access to all data around issue (title, description, comments etc), so can answer more comprehensive questions.

I also have added one question to questions.yml file to capture difference between summarizing issue - LLM is taking into consideration all the data about issue - and summarizing comments.

Screenshots or screen recordings

Screenshots are required for UI changes, and strongly recommended for all other merge requests.

Before	After

How to set up and validate locally

1. Use zero shot rake task to see answers to the issue-related questions.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

ee/lib/gitlab/llm/serializers/issue_serializer.rb

@@ -10,12 +10,34 @@ def serialize(issue:, user:)
               issue: {
                 data: ::IssueSerializer.new(current_user: user,
                   project: issue.project).represent(issue),
-                notes: []
+                notes:
               }
             }
           end
 
-          def notes(issue:, user:); end
+          def notes(issue:, user:)
+            notes = NotesFinder.new(context.current_user, target: resource).execute.by_humans
+            content = if notes.exists?
+                        notes_content = notes_to_summarize(notes) # rubocop: disable CodeReuse/ActiveRecord
+                        options[:notes_content] = notes_content
+                        options[:num] = Random.rand(100..999)
+                      end
+          end
+
+          def notes_to_summarize(notes)
+            notes_content = +""
+            notes.each_batch do |batch|
+              batch.pluck(:id, :note).each do |note| # rubocop: disable CodeReuse/ActiveRecord
+                input_content_limit = provider_prompt_class::INPUT_CONTENT_LIMIT
+
+                break notes_content if notes_content.size + note[1].size >= input_content_limit
+
+                notes_content << note[1]
+              end
+            end
+
+            notes_content
+          end
         end
       end
     end