Add variableValue helper and re-render on dashboard refresh

[asimonok]

Due to variable helper limitation (works only if variable format is not specified). Was added variableValue helper to use replaced variable value.

Example of usage:

<a href="http://localhost?{{variableValue '${slug:queryparam}'}}">Link</a>

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (e651bfb) 98.97% compared to head (26c61d2) 98.74%.

Files	Patch %	Lines
src/components/TextPanel/TextPanel.tsx	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #252      +/-   ##
==========================================
- Coverage   98.97%   98.74%   -0.23%     
==========================================
  Files          34       34              
  Lines         389      399      +10     
  Branches       50       50              
==========================================
+ Hits          385      394       +9     
- Misses          3        4       +1     
  Partials        1        1              

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[mikhail-vl]

Looks great!