Add Iteration popover support for Child/Linked items

Kushal Pandyarequested to merge
455076-show-iteration-popovers-in-child-and-linked-items into master

What does this MR do and why?

Adds support for showing popovers on Iterations within Child and Linked items widgets.

Screenshots or screen recordings

Before After
image image

How to set up and validate locally

  1. Add an iteration and cadences within a group, follow https://docs.gitlab.com/user/group/iterations/
  2. Go to an issue of a project within same group and assign iterations to it
  3. Go back to parent group, create an epic there and add same child issue there.
  4. Hover over the child issue's iteration field for a popover with iteration details.
    • The feature should also work for Linked items.

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Related to #455076 (closed)

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