Remove boost::filesystem

[mdemoret-nv]

Description

This PR removes all references to boost::filesystem in favor of std::filesystem. The std library should be preferred over the boost version

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[codecov]

Codecov Report

Merging #334 (b970681) into branch-23.07 (0d0ab70) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@              Coverage Diff              @@
##           branch-23.07     #334   +/-   ##
=============================================
  Coverage         73.29%   73.29%           
=============================================
  Files               390      390           
  Lines             13382    13382           
  Branches           1009     1010    +1     
=============================================
  Hits               9809     9809           
  Misses             3573     3573           

Flag	Coverage Δ
cpp	69.26% <ø> (ø)
py	42.25% <ø> (ø)

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Impacted Files	Coverage Δ
cpp/mrc/src/public/modules/plugins.cpp	54.26% <ø> (ø)

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[mdemoret-nv]

/merge