Remove use of KResponsiveWindowMixin within KDS

[rtibbles]

Description

Updates all internal uses of KResponsiveWindowMixin to use the useKResponsiveWindow composable instead.
Factor out window resizing utilities from the useKResponsiveWindow composable and reuse for all tests using the composable.
Update documentation to recommend the composable over the mixin.

Changelog

• [#PR no]
  • Description: Remove use of KResponsiveWindowMixin internally
  • Products impact: - none
  • Addresses: -
  • Components: KDateRange, KModal, KPageContainer, KGrid, KFixedGrid, KGridItem, KFixedGridItem
  • Breaking: no
  • Impacts a11y: no
  • Guidance: Updates all components to use the useKResponsiveWindow composable

[#PR no]: PR link

Steps to test

(optional) Implementation notes

At a high level, how did you implement this?

Does this introduce any tech-debt items?

Testing checklist

• Contributor has fully tested the PR manually
• If there are any front-end changes, before/after screenshots are included
• Critical and brittle code paths are covered by unit tests
• The change is described in the changelog section above

Reviewer guidance

• Is the code clean and well-commented?
• Are there tests for this change?
• Are all UI components LTR and RTL compliant (if applicable)?
• Add other things to check for here

After review

• The changelog item has been pasted to the CHANGELOG.md

Comments

[MisRob]

Neat

[MisRob]

Thanks @rtibbles, that's helpful