fix(factory): skip symlinks/junctions during directory scan (fixes #690)

[chirag127]

Summary

Skip symbolic links and directory junctions when scanning InstallLocation for executables. Fixes #690.

Problem

BCU currently enumerates .exe files and subdirectories with directory.GetFiles(...) / directory.GetDirectories() and treats each result as if it were regular content. If a symlink or junction points at another location, BCU:

1. Adds a duplicate entry pointing at the linked target
2. In the worst case (link points back inside the scan tree), recurses into the same content the parent scan already covered

Report: #690.

Fix

In AppExecutablesSearcher.ScanDirectory:

• Filter top-level .exe matches with (f.Attributes & FileAttributes.ReparsePoint) == 0
• Filter .exe matches inside recognised binary subdirectories with the same check
• Skip whole subdirectories that are reparse points before recursing / classifying them

FileAttributes.ReparsePoint covers symlinks (created with mklink / New-Item -ItemType SymbolicLink) and directory junctions (created with mklink /J).

Changes

File	Δ
source/UninstallTools/Factory/InfoAdders/AppExecutablesSearcher.cs	+10, -2

Net 8 lines. No changes to behaviour for regular files/directories.

Test plan

• Create a scenario with a symlink inside InstallLocation:

  mklink /D "C:\Program Files\SomeApp\linked" "C:\some\other\dir"
  

• Scan with BCU
• Before this fix: SortedExecutables includes .exe files from the linked target and duplicates any dupes
• After: SortedExecutables is unchanged as if linked/ did not exist

Related

• Fixes exclude symlink as a program #690.
• Companion PR feat(UninstallerType): detect Squirrel/Electron auto-updater installs (fixes half of #949) #951 (Squirrel/Electron detection, fixes half of Detect Squirrel / Electron auto-updater apps (%LocalAppData%\<Vendor>\<App>\Update.exe --uninstall) #949) is independent — different branch, different concern.