Lost particle track files

[viktormai]

Description

When a particle is lost during transport, OpenMC now (with this PR) automatically replays it from its original source site with tracking enabled, writing the full track history to tracks.h5 without requiring a manual -r/-t restart. Previously, diagnosing a lost particle required identifying it from the warning output, then re-running with the restart file — this change eliminates that step entirely. If there are multiple lost particles, each is written to separate parts of one tracks.h5 file to avoid clogging up the directory.

• Added run_lost_particle_track() in particle_restart.cpp which reconstructs and replays the lost particle from the source bank with write_track = true
• Added in_lost_track thread-local flag to prevent infinite recursion if the replayed particle is also lost
• Added lost_particle_track_file_open flag to manage a separate track file lifecycle from the normal --track workflow
• Wrapped warning() and track file abort logic in appropriate #pragma omp critical blocks for thread safety
• Guarded all HDF5 file operations with >= 0 checks after initializing track_file and track_dtype to -1
• Added dataset name deduplication via H5Lexists to prevent HDF5 errors if multiple lost particles share an ID
• Reset all track state variables on simulation_init and ensured proper file closure on simulation_finalize
• Also, a suggested change to the naming format for particle restart files: "batch_{}_particle_{}" as opposed to "particle_{}_{}" for clarity on which batch a restart file belongs to

This will also later support functionality in the plotter to help visualize particle failures in the geometry.

Checklist

• I have performed a self-review of my own code
• I have run clang-format (version 18) on any C++ source files (if applicable)
• I have followed the style guidelines for Python source files (if applicable)
• I have made corresponding changes to the documentation (if applicable)
• I have added tests that prove my fix is effective or that my feature works (if applicable)