feat: RKN-monitoring to AtlasStepper, change type int->size_t

[AJPfleger]

Similar to the PR feat: add RKN-monitoring to EigenStepper (State and root) #1256 this one adds the monitoring also to the AtlasStepper.

We also change the type of the variable nStepTrials from int to size_t up to the root-writer, since the EigenStepper uses this type and we want to avoid type conversions.

The previous PR feat: add RKN-monitoring to EigenStepper (State and root) #1256 is missing the update of the (c)-dates. This is fixed in this PR. Therefore the following files have no changes but the date in this PR:

• Core/include/Acts/Propagator/EigenStepper.hpp
• Core/include/Acts/Propagator/EigenStepper.ipp
• Examples/Io/Root/src/RootPropagationStepsWriter.cpp

[codecov]

Codecov Report

Merging #1264 (fecf78f) into main (bd55ecb) will increase coverage by 0.00%.
The diff coverage is 66.66%.

@@           Coverage Diff           @@
##             main    #1264   +/-   ##
=======================================
  Coverage   47.48%   47.48%           
=======================================
  Files         376      376           
  Lines       19816    19819    +3     
  Branches     9308     9308           
=======================================
+ Hits         9410     9412    +2     
- Misses       4016     4017    +1     
  Partials     6390     6390           

Impacted Files	Coverage Δ
Core/include/Acts/Propagator/ConstrainedStep.hpp	74.50% <ø> (ø)
Core/include/Acts/Propagator/EigenStepper.hpp	68.42% <ø> (ø)
Core/include/Acts/Propagator/EigenStepper.ipp	50.73% <ø> (ø)
Core/include/Acts/Propagator/AtlasStepper.hpp	70.99% <66.66%> (-0.02%)	⬇️

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