refactor: Always create bound states in (C)KF

[XiaocongAi]

In the current (C)KF, a curvilinear state is created if the track reaches the passive material surface. This was initially implemented due to the reason that a bound state on a Cylinder surface is not working properly. However, this seems to be not the case any more. Hence, bound states are alwasy created, which should be more accurate.

[codecov]

Codecov Report

Merging #936 (4636875) into main (360b29d) will increase coverage by 0.08%.
The diff coverage is 5.55%.

@@            Coverage Diff             @@
##             main     #936      +/-   ##
==========================================
+ Coverage   48.66%   48.75%   +0.08%     
==========================================
  Files         331      331              
  Lines       17131    17101      -30     
  Branches     8092     8070      -22     
==========================================
  Hits         8337     8337              
+ Misses       3087     3057      -30     
  Partials     5707     5707              

Impacted Files	Coverage Δ
...de/Acts/TrackFinding/CombinatorialKalmanFilter.hpp	30.16% <0.00%> (+1.67%)	⬆️
Core/include/Acts/TrackFitting/KalmanFitter.hpp	38.06% <9.09%> (+1.00%)	⬆️

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[paulgessinger]

Seems fine and makes sense to change if the problem on cylinder surfaces is gone.