Replace double quotes in prompt

What does this MR do and why?

Replaces double quotes with single quotes

Screenshots or screen recordings

No UI changes

Before	After

How to set up and validate locally

Make sure that Explain Code still gives correct replies for both code and non-code

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.

Related to #417130 (closed)