Breadcrumbs on concept page

[osma]

Reasons for creating this PR

Implement the breadcrumb display on the concept page.

With long paths, the top levels are initially hidden. Clicking on the first ... will display the hidden paths. This is implemented using the Collapse functionality in Bootstrap.

Link to relevant issue(s), if any

• part of Epic: Concept Page #1484

Description of the changes in this PR

• add a section to the concept page template that displays breadcrumbs
• add corresponding CSS styles
• add translations for the string "Breadcrumbs", used as the aria-label value for the breadcrumb navigation element
• rename some variables passed from WebController to the twig templates to give them more descriptive names

Known problems or uncertainties in this PR

• needs Cypress tests
• verify accessibility

Checklist

• phpUnit tests pass locally with my changes
• I have added tests that show that the new code works, or tests are not relevant for this PR (e.g. only HTML/CSS changes)
• The PR doesn't reduce accessibility of the front-end code (e.g. tab focus, scaling to different resolutions, use of .sr-only class, color contrast)
• The PR doesn't introduce unintended code changes (e.g. empty lines or useless reindentation)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d0aa524) 70.54% compared to head (59104e2) 70.54%.
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1586   +/-   ##
=========================================
  Coverage     70.54%   70.54%           
  Complexity     1644     1644           
=========================================
  Files            32       32           
  Lines          4315     4315           
=========================================
  Hits           3044     3044           
  Misses         1271     1271           

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[sonarqubecloud]

Quality Gate passed

The SonarCloud Quality Gate passed, but some issues were introduced.

2 New issues
0 Security Hotspots
No data about Coverage
0.7% Duplication on New Code

See analysis details on SonarCloud

[miguelvaara]

In the review:

• General overview -> looks good!
• Tested the behavior of breadcrumbs on long paths -> looks good!
• Tested functionality - it works!
• Compared against the agreed Definition of Ready for PRs -> nearly meets the requirements (In the PR exceptions were mentioned)
• Exceeds the exceptions mentioned in the PR as it includes comprehensive Cypress tests with excellent comments.
• Compared against the agreed layout guide and currently aligns well with it (styles will be refined later) and is already quite close to the final goal.

Well done!