Check for write permission before entering portable mode

[droidmonkey]

• Fix Check for directory write permissions prior to entering portable mode #7585

Testing strategy

Tested on Windows with a portable build from this branch and setting only read/list permissions on the directory.

Type of change

• ✅ Bug fix (non-breaking change that fixes an issue)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.66%. Comparing base (bdeef63) to head (203f6a1).
Report is 396 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #8447      +/-   ##
===========================================
+ Coverage    64.64%   64.66%   +0.03%     
===========================================
  Files          338      338              
  Lines        43614    43615       +1     
===========================================
+ Hits         28190    28203      +13     
+ Misses       15424    15412      -12     

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