Fix Copy Command Collisions

[bstopp]

Description

Check that source and destination of copy operation are not the same.

Related Issue

Fix #61

Motivation and Context

Copy operations were causing loss of history if pasted to same directory.

How Has This Been Tested?

Added unit tests.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.52%. Comparing base (182f7cd) to head (289591d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #65      +/-   ##
==========================================
+ Coverage   45.31%   47.52%   +2.20%     
==========================================
  Files          38       38              
  Lines        1772     1776       +4     
==========================================
+ Hits          803      844      +41     
+ Misses        969      932      -37     

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