feat: 5700 - no click for KP title without additional elements

[monsieurtanuki]

What

• Now we check if a KP title has additional elements to display.
• If not, we don't make it clickable - no tap action, no forward arrow.

Fixes bug(s)

• Fixes: Do not make knowledge panels tappable if they contain only a title and no elements #5700

Impacted files

• knowledge_panel_card.dart: overrides the "isClickable" parameter in case there are eventually no further elements to display
• knowledge_panels_builder.dart: new helper methods

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 21 lines in your changes missing coverage. Please review.

Project coverage is 6.78%. Comparing base (4d9c7fc) to head (a30f332).
Report is 377 commits behind head on develop.

Files with missing lines	Patch %	Lines
.../lib/knowledge_panel/knowledge_panels_builder.dart	0.00%	17 Missing ⚠️
...e_panel/knowledge_panels/knowledge_panel_card.dart	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #5709      +/-   ##
==========================================
- Coverage     9.54%   6.78%   -2.77%     
==========================================
  Files          325     404      +79     
  Lines        16411   21601    +5190     
==========================================
- Hits          1567    1466     -101     
- Misses       14844   20135    +5291     

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[teolemon]

Good. It can be tested on .net

[monsieurtanuki]

Thank you @teolemon for your review!