Fix: Fixed an issue with dropping multiple items onto executable files

[antonioseet]

…also checks to see if python is installed on system before allowing the drop like in File Explorer.
removed redundant code

Resolved / Related Issues

• Were these changes approved in an issue or discussion with the project maintainers? In order to prevent extra work, feature requests and changes to the codebase must be approved before the pull request will be reviewed. This prevents extra work for the contributors and maintainers.
  Closes Bug: Drag-and-Drop Multiple Files Opens Multiple Instances Instead of Passing as Arguments for .py and .bat Files #14033

Validation
How did you test these changes?

• Did you build the app and test your changes?
• Did you check for accessibility? You can use Accessibility Insights for this.
• Did you remove any strings from the en-us resource file?
  • Did you search the solution to see if the string is still being used?
• Did you implement any design changes to an existing feature?
  • Was this change approved?
• Are there any other steps that were used to validate these changes?
  1. Open app ...
  2. Create 4 types of files: test.py, test.bat, test.cmd, test.exe. Each created to test incoming arguments list.
     
     
     
     

Tested dragging and dropping multiple files to each of them to verify changes:

Also validated that when python is not installed, the user cannot drop files onto the python file.

[yaira2]

LGTM