refactor: replace long unsigned int with std::size_t (#3930)

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->

## Summary by CodeRabbit

- **New Features**
	- Enhanced error handling for input space points in the GbtsSeedingAlgorithm.
	- Improved seed finding logic based on internal ROI descriptors.

- **Bug Fixes**
	- Updated handling of mapping logic to ensure clarity and prevent missing keys.

- **Refactor**
	- Changed variable types from `long unsigned int` to `std::size_t` across multiple components for improved type safety.

- **Tests**
	- Updated loop index types in various test cases to enhance type safety and align with best practices.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Examples/Algorithms/TrackFinding/src/GbtsSeedingAlgorithm.cpp

@@ -355,7 +355,7 @@ ActsExamples::GbtsSeedingAlgorithm::LayerNumbering() const {
     }
   });
 
-  for (long unsigned int i = 0; i < input_vector.size(); i++) {
+  for (std::size_t i = 0; i < input_vector.size(); i++) {
     input_vector[i].m_refCoord = input_vector[i].m_refCoord / count_vector[i];
   }
 

Examples/Io/Root/include/ActsExamples/Io/Root/RootAthenaDumpReader.hpp

@@ -172,7 +172,7 @@ class RootAthenaDumpReader : public IReader {
   /// Vector of {eventNr, entryMin, entryMax}
   std::vector<std::tuple<std::uint32_t, std::size_t, std::size_t>> m_eventMap;
   std::shared_ptr<TChain> m_inputchain;
-  long unsigned int m_events;
+  std::size_t m_events;
   bool m_haveStripFeatures = true;
 
   static constexpr unsigned int maxCL = 1500000;

Tests/UnitTests/Plugins/GeoModel/GeoBoxToVolumeTest.cpp

@@ -58,7 +58,7 @@ BOOST_AUTO_TEST_CASE(GeoBoxToSensitiveConversion) {
   const auto* bounds =
       dynamic_cast<const Acts::CuboidVolumeBounds*>(&volumeBox->volumeBounds());
   std::vector<double> convHls = bounds->values();
-  for (long unsigned int i = 0; i < hls.size(); i++) {
+  for (std::size_t i = 0; i < hls.size(); i++) {
     BOOST_CHECK(hls[i] == convHls[i]);
   }
 }

Tests/UnitTests/Plugins/GeoModel/GeoDetectorObjectTest.cpp

@@ -43,7 +43,7 @@ void test(const Acts::GeoModelDetectorObjectFactory::Cache& cache,
           GeoModelDetObj::GeoDims geoDims) {
   for (const auto& box : cache.boundingBoxes) {
     const Acts::VolumeBounds& bounds = box->volumeBounds();
-    for (long unsigned int i = 0; i < geoDims.boxO.size(); i++) {
+    for (std::size_t i = 0; i < geoDims.boxO.size(); i++) {
       BOOST_CHECK(geoDims.boxO[i] == bounds.values()[i]);
     }
     std::vector<const Acts::Surface*> surfaces = box->surfaces();
@@ -75,7 +75,7 @@ void test(const Acts::GeoModelDetectorObjectFactory::Cache& cache,
             dynamic_cast<const Acts::TrapezoidBounds*>(&sbounds);
         std::vector<Acts::Vector2> trapVerts = trapBounds->vertices();
 
-        for (long unsigned int i = 0; i < trapVerts.size(); i++) {
+        for (std::size_t i = 0; i < trapVerts.size(); i++) {
           BOOST_CHECK(trapVerts[i][0] == geoDims.trapVerts[i][0]);
           BOOST_CHECK(trapVerts[i][1] == geoDims.trapVerts[i][1]);
         }

Tests/UnitTests/Plugins/GeoModel/GeoPolyConverterTests.cpp

@@ -88,15 +88,15 @@ BOOST_AUTO_TEST_CASE(GeoModelDetectorObjectFactory) {
   const auto* polyBounds =
       dynamic_cast<const Acts::DiamondBounds*>(&polySurface->bounds());
   std::vector<Acts::Vector2> convPolyVerts = polyBounds->vertices();
-  for (long unsigned int i = 0; i < polyVerts.size(); i++) {
+  for (std::size_t i = 0; i < polyVerts.size(); i++) {
     BOOST_CHECK(polyVerts[i][0] == convPolyVerts[i][0]);
     BOOST_CHECK(polyVerts[i][1] == convPolyVerts[i][1]);
   }
 
   const auto* trapBounds =
       dynamic_cast<const Acts::TrapezoidBounds*>(&trapSurface->bounds());
   std::vector<Acts::Vector2> convTrapVerts = trapBounds->vertices();
-  for (long unsigned int i = 0; i < trapVerts.size(); i++) {
+  for (std::size_t i = 0; i < trapVerts.size(); i++) {
     BOOST_CHECK(trapVerts[i][0] == convTrapVerts[i][0]);
     BOOST_CHECK(trapVerts[i][1] == convTrapVerts[i][1]);
   }

Tests/UnitTests/Plugins/GeoModel/GeoTubeToVolumeTest.cpp

@@ -56,7 +56,7 @@ BOOST_AUTO_TEST_CASE(GeoBoxToSensitiveConversion) {
   const auto* bounds = dynamic_cast<const Acts::CylinderVolumeBounds*>(
       &volumeTube->volumeBounds());
   std::vector<double> convDims = bounds->values();
-  for (long unsigned int i = 0; i < dims.size(); i++) {
+  for (std::size_t i = 0; i < dims.size(); i++) {
     BOOST_CHECK(dims[i] == convDims[i]);
   }
 }