test: fix grid-pro tests

[tomivirkki]

Description

Fix GridPro test cases to make them pass with this web component change.

This change should be cherry-picked to 24.5 and 24.4

Type of change

Tests

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.98%. Comparing base (b944930) to head (c1ede7b).
Report is 24 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #260      +/-   ##
==========================================
- Coverage   95.89%   94.98%   -0.91%     
==========================================
  Files          30       31       +1     
  Lines         292      299       +7     
  Branches       35       35              
==========================================
+ Hits          280      284       +4     
  Misses          3        3              
- Partials        9       12       +3     

Flag	Coverage Δ
unittests	94.98% <ø> (-0.91%)	⬇️

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