Add `move_before_id` and `move_after_id` to issue creation mutation

What does this MR do and why?

This allows specifying the position of an issue upon creation. This is going to be used on issue boards where we want to position the issue at the top of the list upon creation.

Without this param, newly created issues are added to the end by default.

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 #341562 (closed)