Handle unauthorized files / dirs for cleanup

[pauld-msft]

Issue reported by customer. Agents that do not even have read access to some parts of the file system can run into issues when trying to determine the files and directories that need to be cleaned up.

Fix: error handle the unauthorized exception, and skip cleanup for those cases

[codecov]

Codecov Report

Attention: Patch coverage is 81.33333% with 14 lines in your changes missing coverage. Please review.

Project coverage is 89.7%. Comparing base (8a744bf) to head (a1459bc).

Files with missing lines	Patch %	Lines
...tion.Contracts/FileComponentDetectorWithCleanup.cs	69.5%	11 Missing and 3 partials ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1328   +/-   ##
=====================================
  Coverage   89.7%   89.7%           
=====================================
  Files        387     387           
  Lines      30272   30305   +33     
  Branches    1871    1871           
=====================================
+ Hits       27161   27191   +30     
- Misses      2713    2715    +2     
- Partials     398     399    +1     

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