feat: Refactor process command execution to remove explicit shell and…

[zzjin]

… simplify file mime type handling.

Description

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Checklist:

• I have updated the documentation (if required).
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.
• I added a picture of a cute animal cause it's fun