Allow to pass a ToString as title to DataDisplays

[bjoernricks]

What

Allow to pass a ToString as title to DataDisplays

Why

Don't require to pass a function if a function is not necessary for generating a display title.

References

https://jira.greenbone.net/browse/GEA-2019

Checklist

• I have added tests for the changes
• I have used the following LLMs/AI tools in this pull request:

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Snapshot Warnings

⚠️: No snapshots were found for the head SHA 65bd711.

Ensure that dependencies are being submitted on PR branches and consider enabling retry-on-snapshot-warnings. See the documentation for more information and troubleshooting advice.

Scanned Files

None

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.06%. Comparing base (cf60650) to head (65bd711).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5661   +/-   ##
=======================================
  Coverage   87.06%   87.06%           
=======================================
  Files        1304     1304           
  Lines       34135    34137    +2     
  Branches    10322    10285   -37     
=======================================
+ Hits        29719    29721    +2     
  Misses       3977     3977           
  Partials      439      439           

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