[#3570] Use CMS page title for vragen

[pi-sigma]

Summary

The title for vragen was hardcoded to 'Mijn vragen'. We now use the configurable title from the CMS page.

Issue References

• Taiga Issue: https://taiga.maykinmedia.nl/project/open-inwoner/issue/3570

Checklist

• CHANGELOG.rst updated

[codecov-commenter]

Codecov Report

❌ Patch coverage is 94.44444% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 92.52%. Comparing base (589814f) to head (bb94a12).

Files with missing lines	Patch %	Lines
src/open_inwoner/accounts/views/contactmoments.py	92.85%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2013   +/-   ##
========================================
  Coverage    92.52%   92.52%           
========================================
  Files         1213     1213           
  Lines        45826    45840   +14     
========================================
+ Hits         42401    42414   +13     
- Misses        3425     3426    +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.