Add trafficlight feedback frontend

[MaHaWo]

• refactor the old feedback frontend from Add trafficlight feedback #183 into the latest available design from @Majapur1
• add in a max number of answersessions that are displayed at once (currently 4) and make it navigable such that the history can be viewed in blocks of 4
• try to fix styling to work better with mobile screen sizes
• add better explanations in localization file
• add a navigation button to the child card to get to the current feedback
• fix bug in milestone indexing that would not allow to complete a milestone if answered with the lowest score.
• add a second milestonegroup route specifically for milestonegroups of an answersession which is helpful for the feedback because it is displayed on a per answersession basis
• fix a problem in the tests where the age bin a certain milestoneanswersession would fall into was dependent on the current date.
  fixes Implement traffic light feedback #155

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 14.61187% with 187 lines in your changes missing coverage. Please review.

Project coverage is 32.72%. Comparing base (de3f78d) to head (2717c8f).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...rontend/src/lib/components/ChildrenFeedback.svelte	0.00%	177 Missing and 1 partial ⚠️
...end/src/lib/components/ChildrenRegistration.svelte	0.00%	3 Missing ⚠️
frontend/src/lib/components/MilestoneGroup.svelte	0.00%	2 Missing ⚠️
frontend/src/lib/components/Milestone.svelte	0.00%	1 Missing ⚠️
...ontend/src/lib/components/MilestoneOverview.svelte	0.00%	1 Missing ⚠️
frontend/src/lib/stores/componentStore.ts	0.00%	1 Missing ⚠️
frontend/src/lib/stores/contentStore.svelte.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #214      +/-   ##
==========================================
- Coverage   34.60%   32.72%   -1.89%     
==========================================
  Files         109      111       +2     
  Lines        3742     4025     +283     
  Branches       94       96       +2     
==========================================
+ Hits         1295     1317      +22     
- Misses       2368     2627     +259     
- Partials       79       81       +2     

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[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud