Fluid and fixed breadcrumbs for super sidebar toggle

What does this MR do and why?

• Update breadcrumbs to be full width and fixed for super sidebar
  • Remove custom styles to absolute position super-sidebar-toggle
  • Remove gl-relative wrapping class for breadcrumbs
  • Add breadcrumbs_class and breadcrumbs_container_class variables
• Update existing sticky headers to compensate for breadcrumbs height
  • Add --breadcrumbs-height to be added with .with-breadcrumbs conditional class
  • Add --breadcrumbs-height to $calc-application-header-height variable
  • Update .layout-page and .boards-sidebar with $calc-application-header-height and $calc-application-footer-height variables

Screenshots or screen recordings

Default

CleanShot_2023-04-04_at_16.04.38

Issue

CleanShot_2023-04-04_at_16.06.05

Merge request

CleanShot_2023-04-04_at_16.05.02

CleanShot_2023-04-04_at_16.05.33

Epic

CleanShot_2023-04-04_at_16.06.36

Job

CleanShot_2023-04-04_at_16.07.02

Board

CleanShot_2023-04-04_at_16.29.20

How to set up and validate locally

1. Enable super sidebar (if not currently on)
   1. In rails c enabled feature flag Feature.enable(:super_sidebar_nav)
   2. Toggle on "new navigation" in user menu
2. Scroll on any page, breadcrumbs should stick to top of viewport, note:
   1. With sticky MR header http://127.0.0.1:3000/flightjs/Flight/-/merge_requests/4
   2. With sticky Issue header http://127.0.0.1:3000/flightjs/Flight/-/issues/33
   3. With sticky Epic header http://127.0.0.1:3000/groups/flightjs/-/epics/5
   4. With sticky Job header http://127.0.0.1:3000/flightjs/Flight/-/jobs/675

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 #393468 (closed)