Fix images not rendering when summarizing an issue

[Copilot]

Fix Images Not Rendering When Summarizing Issues/Notifications

Plan:

• Analyze the issue - Images in markdown format (![alt](url)) are not being rendered in the notification/issue summary output
• Identify root cause - The LLM summarization instructions don't include guidance to preserve images in markdown format
• Update summarizeNotificationsTool.ts to add instructions for preserving images in the output
• Update summarizeIssueTool.ts to add instructions for preserving images in the output
• Test the changes manually to verify images render correctly
• Run linter and fix any issues
• Request code review
• Run security scan

Original prompt

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This section details on the original issue you should resolve

<issue_title>Images do not render when summarizing an issue.</issue_title>
<issue_description>> Images do not render:

Originally posted by @joyceerhl in #6339</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Images do not render when summarizing an issue. #6507

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