Remove redundant copy of libmrc_pymrc.so

[dagardner-nv]

Description

• Prevent libmrc_pymrc.so from being installed into python's site-packages dir, as this lib is already present in the lib dir.
• Fixes permissions issue where the conda env was owned by root:root, simply ensuring the env retains the conda group permission wasn't sufficient as cmake attempts to modify exiting dirs (https://gitlab.kitware.com/cmake/cmake/-/issues/10978), and running chmod -R after the fact is too slow.

Closes #428

Checklist

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

[mdemoret-nv]

Lets make sure the conda build works correctly on this before mergine.

[codecov]

Codecov Report

Merging #429 (c8e07f2) into branch-24.03 (368fe7a) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@              Coverage Diff              @@
##           branch-24.03     #429   +/-   ##
=============================================
  Coverage         74.00%   74.00%           
=============================================
  Files               394      394           
  Lines             13955    13955           
  Branches           1053     1053           
=============================================
  Hits              10327    10327           
  Misses             3628     3628           

Flag	Coverage Δ
cpp	70.47% <ø> (ø)
py	42.61% <ø> (ø)

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[dagardner-nv]

/merge