Log Path.GetFullPath input path in FileAccessRepository when there's an exception

[denilsonm]

I'm getting the following error message in my build:

##[warning]HandleFileAccess failed after 0 ms: System.NotSupportedException: The given path's format is not supported.
  at System.Security.Permissions.FileIOPermission.EmulateFileIOPermissionChecks(String fullPath)
  at System.Security.Permissions.FileIOPermission.QuickDemand(FileIOPermissionAccess access, String fullPath, Boolean checkForDuplicates, Boolean needFullPath)
  at Microsoft.MSBuildCache.FileAccess.FileAccessRepository.FileAccessesState.AddFileAccess(FileAccessData fileAccessData) in D:\a\_work\1\s\src\Common\FileAccess\FileAccessRepository.cs:line 173
  at Microsoft.MSBuildCache.MSBuildCachePluginBase`1.HandleFileAccessInner(FileAccessContext fileAccessContext, FileAccessData fileAccessData) in D:\a\_work\1\s\src\Common\MSBuildCachePluginBase.cs:line 511
  at Microsoft.MSBuildCache.MSBuildCachePluginBase`1.<>c__DisplayClass62_0.<HandleFileAccess>b__0() in D:\a\_work\1\s\src\Common\MSBuildCachePluginBase.cs:line 491
  at Microsoft.MSBuildCache.MSBuildCachePluginBase`1.TimeAndLog(PluginLoggerBase logger, Action inner, String memberName) in D:\a\_work\1\s\src\Common\MSBuildCachePluginBase.cs:line 1329

Having this would help debug it