fix(install): Avoid error when unlinking non-existent junction/hardlink

[HUMORCE]

Description

Motivation and Context

Closes #5511 #5473

How Has This Been Tested?

Before:

PS C:\Users\WDAGUtilityAccount> scoop install 7zip -u
Installing '7zip' (22.01) [64bit] from main bucket
Loading 7z2201-x64.msi from cache
Checking hash of 7z2201-x64.msi ... ok.
Extracting 7z2201-x64.msi ... done.
Linking ~\scoop\apps\7zip\current => ~\scoop\apps\7zip\22.01
Creating shim for '7z'.
Creating shim for '7zFM'.
Creating shim for '7zG'.
Creating shortcut for 7-Zip (7zFM.exe)
Persisting Codecs
Persisting Formats
Running post_install script...
'7zip' (22.01) was installed successfully!
Notes
-----
Add 7-Zip as a context menu option by running:
"C:\Users\WDAGUtilityAccount\scoop\apps\7zip\current\install-context.reg"
PS C:\Users\WDAGUtilityAccount> # 'Codecs', 'Formats' Deleted.
PS C:\Users\WDAGUtilityAccount> scoop uninstall 7zip
Uninstalling '7zip' (22.01).
Removing shim '7z.shim'.
Removing shim '7z.exe'.
Removing shim '7zFM.shim'.
Removing shim '7zFM.exe'.
Removing shim '7zG.shim'.
Removing shim '7zG.exe'.
Removing shortcut ~\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Scoop Apps\7-Zip.lnk
Unlinking ~\scoop\apps\7zip\current
Get-Item : Cannot find path 'C:\Users\WDAGUtilityAccount\scoop\apps\7zip\22.01\Codecs' because it does not exist.
At C:\Users\WDAGUtilityAccount\scoop\apps\scoop\current\lib\install.ps1:1188 char:23
+             $source = Get-Item "$dir\$source"
+                       ~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (C:\Users\WDAGUt...ip\22.01\Codecs:String) [Get-Item], ItemNotFoundExcep
   tion
    + FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.GetItemCommand

Get-Item : Cannot find path 'C:\Users\WDAGUtilityAccount\scoop\apps\7zip\22.01\Formats' because it does not exist.
At C:\Users\WDAGUtilityAccount\scoop\apps\scoop\current\lib\install.ps1:1188 char:23
+             $source = Get-Item "$dir\$source"
+                       ~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (C:\Users\WDAGUt...p\22.01\Formats:String) [Get-Item], ItemNotFoundExcep
   tion
    + FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.GetItemCommand

'7zip' was uninstalled.

After:

PS C:\Users\WDAGUtilityAccount> scoop install 7zip -u
Installing '7zip' (22.01) [64bit] from main bucket
Loading 7z2201-x64.msi from cache
Checking hash of 7z2201-x64.msi ... ok.
Extracting 7z2201-x64.msi ... done.
Linking ~\scoop\apps\7zip\current => ~\scoop\apps\7zip\22.01
Creating shim for '7z'.
Creating shim for '7zFM'.
Creating shim for '7zG'.
Creating shortcut for 7-Zip (7zFM.exe)
Persisting Codecs
Persisting Formats
Running post_install script...
'7zip' (22.01) was installed successfully!
Notes
-----
Add 7-Zip as a context menu option by running:
"C:\Users\WDAGUtilityAccount\scoop\apps\7zip\current\install-context.reg"
PS C:\Users\WDAGUtilityAccount> # 'Codecs', 'Formats' Deleted.
PS C:\Users\WDAGUtilityAccount> scoop uninstall 7zip
Uninstalling '7zip' (22.01).
Removing shim '7z.shim'.
Removing shim '7z.exe'.
Removing shim '7zFM.shim'.
Removing shim '7zFM.exe'.
Removing shim '7zG.shim'.
Removing shim '7zG.exe'.
Removing shortcut ~\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Scoop Apps\7-Zip.lnk
Unlinking ~\scoop\apps\7zip\current
'7zip' was uninstalled.

Checklist:

• I have read the Contributing Guide.
• I have ensured that I am targeting the develop branch.
• I have updated the documentation accordingly.
• I have updated the tests accordingly.
• I have added an entry in the CHANGELOG.

[rashil2000]

Looks fine, update changelog?

[HUMORCE]

Done