Improve event listeners in ic-footer-link and ic-footer-link-group components

## What is the purpose of the work?
To reduce the scope of target for listening to footerResized event.

## Why do we need it?
Currently the ic-footer-link and ic-footer-link-group components listen to the footerResized event emitted by ic-footer at the document level. This means that code in unnecessarily run when there are multiple ic-footer components on a page.

This is relatively unlikely in practice, but does affect the guidance site and storybook stories

## Additional information
This can be resolved by taking an approach similar to ic-navigation-item, where the listener is added on the parent element, rather than using the Stencil Listen decorator

Locate the ic-footer-link, ic-footer-link-group, and ic-navigation-item entry points, then compare how their footerResized listeners are wired. Verify that listening is scoped to the relevant parent ic-footer instead of document-level handling, and that multiple footer components no longer trigger unrelated listeners.

Written by the indexing model from the issue text.