memory: Remove allocator_traits specialization detection

[stotko]

In order to safely skip calling destroy on trivial types, the allocator_traits class is also checked for specializations where the behavior of the construct and destroy functions could potentially be changed in an arbitrary and unpredictable way. As of C++23, such specializations have been forbidden. Thus, remove the check to reduce the maintenance burden.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.08 🎉

Comparison is base (64f4fe2) 97.32% compared to head (dd26fd6) 97.40%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #376      +/-   ##
==========================================
+ Coverage   97.32%   97.40%   +0.08%     
==========================================
  Files          31       31              
  Lines        2505     2547      +42     
==========================================
+ Hits         2438     2481      +43     
+ Misses         67       66       -1     

Impacted Files	Coverage Δ
src/stdgpu/impl/deque_detail.cuh	94.09% <100.00%> (ø)
src/stdgpu/impl/memory_detail.h	99.00% <100.00%> (-0.01%)	⬇️
src/stdgpu/impl/unordered_base_detail.cuh	96.51% <100.00%> (+0.39%)	⬆️
src/stdgpu/impl/vector_detail.cuh	94.59% <100.00%> (ø)

... and 2 files with indirect coverage changes

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