DLSV2-426 Adds missing breadcrumb mobile backlinks

[ynhemanth]

JIRA link

DLSV2-426

Description

Implements the previously missing backlinks to the breadcrumb navbar throughout the Self Assessment interface for mobile layout fallback. These are a feature of the NHS Design System Breadcrumb navigation component.

Screenshots

---

Developer checks

(Leave tasks unticked if they haven't been appropriate for your ticket.)

I have:

• [ y] Run the formatter and made sure there are no IDE errors.
• Written tests for the changes (accessibility tests, unit tests for controller, data services, services, view models, etc)
• [ y] Manually tested my work with and without JavaScript. Full manual testing guidelines can be found here: https://softwiretech.atlassian.net/wiki/spaces/HEE/pages/6703648740/Testing
• Updated/added documentation in Swiki and/or Readme. Links (if any) are below:
  • doc_1_here
• [ y] Updated my Jira ticket with information about other parts of the system that were touched as part of the MR and have to be sanity tested to ensure nothing’s broken.
• [ y] Scanned over my own MR to ensure everything is as expected.

[kevwhitt-hee]

Looks good. The very first page of the self assessment (LearningPortal/SelfAssessments/SelfAssessmentDescription.html - https://localhost:44363/LearningPortal/SelfAssessment/1) is missing a backlink, though. It should have "Back to Current Activities". Without it, there is no in page way of navigating back in a mobile browser.

[kevwhitt-hee]

The <p> tag containing the backlink was in the wrong place in the DOM. I've tweaked the Layout.cshtml file to add a placeholder for it and updated all views to ensure it sits in the placeholder. This results in the back link following the NHS design system definition and improves styling and layout.