feat: check if yOuter takes the square root of a negative number when minHelixRadius < rMax / 2 in SpacePointGrid.ipp

[LuisFelipeCoelho]

This PR adds a check to SpacePointGrid.ipp if minHelixRadius is smaller than config.rMax / 2 as suggested in #1456.

This happens if rMax of the grid in mm is greater than 2 x pT[GeV] / (3·10-4 × B[T]). I am not sure if this combination of parameters makes sense in one specific detector configuration.

@robertlangenberg

[codecov[bot]]

Codecov Report

Merging #1466 (39df28e) into main (b172918) will decrease coverage by 0.00%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #1466      +/-   ##
==========================================
- Coverage   48.60%   48.59%   -0.01%     
==========================================
  Files         380      380              
  Lines       20595    20597       +2     
  Branches     9433     9435       +2     
==========================================
  Hits        10010    10010              
- Misses       4097     4099       +2     
  Partials     6488     6488              

Impacted Files	Coverage Δ
Core/include/Acts/Seeding/SpacePointGrid.ipp	0.00% <0.00%> (ø)

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