Fixed iid_path modal bug

What does this MR do and why?

Added support for using iids within modals.

Screenshots or screen recordings

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

How to set up and validate locally

1. In rails console enable the okrs_mvc feature flag

   Feature.enable(:okrs_mvc)

2. Create an Objective in the issue list of a project.
3. Create a KR in the Objective.
4. Open the KR.

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 #387663 (closed)