chore: update stackblitz url in issue template

[MatanBobi]

What: This PR adds Stackblitz url for reproduction in the Issue template.

[codesandbox-ci]

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Sandbox	Source
React	Configuration
react-testing-library-examples	Configuration

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d80319f) 100.00% compared to head (be31874) 100.00%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #1258   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines          192       192           
  Branches        40        38    -2     
=========================================
  Hits           192       192           

Flag	Coverage Δ
canary	100.00% <ø> (ø)
experimental	100.00% <ø> (ø)
latest	100.00% <ø> (ø)

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