Replace Core State counter synchronization with host functors or device kernel calls

[LSchwiebert]

This PR replaces the synchronized Core State counter getter and setter functions with device kernel calls or host functors. These getter and setter functions were introduced in PR #2177 and #2208, which moved these counters to the device. The objective is to remove synchronization between the host and device when running an event.

Currently, this has code to revise only one synchronization -- the synchronization in the Stepper::operator()(SpanConstPrimary primaries) function -- with a functionally-equivalent executor functor. Once everyone is happy with the solution used here, it will be replicated elsewhere to replace other synchronizations. Just trying to reduce the burden of reviewing similar changes.

[github-actions]

Test summary

 5 908 files   9 446 suites   8m 4s ⏱️
 1 733 tests  1 723 ✅  10 💤 0 ❌
30 668 runs  30 510 ✅ 158 💤 0 ❌

Results for commit 4daf06e.

[codecov]

Codecov Report

❌ Patch coverage is 76.92308% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.28%. Comparing base (599cdbc) to head (4daf06e).

Files with missing lines	Patch %	Lines
src/celeritas/global/detail/SetPending.cc	62.50%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2242      +/-   ##
===========================================
- Coverage    86.87%   85.28%   -1.60%     
===========================================
  Files         1331     1299      -32     
  Lines        42102    40556    -1546     
  Branches     12951    10554    -2397     
===========================================
- Hits         36578    34588    -1990     
- Misses        4319     4378      +59     
- Partials      1205     1590     +385     

Files with missing lines	Coverage Δ
src/celeritas/global/Stepper.cc	100.00% <100.00%> (ø)
src/celeritas/global/detail/SetPending.hh	100.00% <100.00%> (ø)
src/celeritas/global/detail/SetPending.cc	62.50% <62.50%> (ø)

... and 725 files with indirect coverage changes

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