Track description change when creating a task from markdown

What does this MR do and why?

When a task is created from markdown bullet point, we change the original issue or incident description from a bullet item to a task link with task's title being the bullet item text.

We should also make sure this change is tracked in the description versions for audit and traceability.

re #367932 (closed)

Screenshots or screen recordings

These are strongly recommended to assist reviewers and reduce the time to merge your change.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

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.