Refactor PowerShell script for Python and Git installation

[arjunkulkarni0208]

Description:

Related Issue:

Type of Change:

• Bug fix
• New feature
• Documentation update
• Configuration/Infrastructure (Ansible, Docker, CI/CD, build systems)
• Refactoring (no functional changes)
• Performance improvement

How Has This Been Tested?

Testing Status:

• Robot tested (full integration on actual robot)
• Bench tested (hardware components/modules tested on table)
• Locally verified (script/playbook/model runs as expected on dev machine)
• Simulation tested (Gazebo/RViz/MATLAB Simulink/custom sim)
• Builds successfully but not functionally tested yet (explain reason below)

Testing Details:

Screenshots/Evidence (if appropriate):

Breaking Changes & Migration:

What breaks:

How to fix it:

Checklist (Assignee):

• PR tackles a single feature/issue (not mixing multiple unrelated changes)
• No unnecessary changes unrelated to this PR
• Added comments for complex logic, TODOs, non-obvious decisions
• Code compiles/builds without errors or warnings
• Tested according to "Testing Status" section above
• Documentation updated if needed (README, wiki, inline docs)
• Evidence uploaded (rosbags/videos/screenshots/logs as appropriate)
• Added correct PR labels (enhancement, bug, embedded, ros, perception, ansible, docker, matlab, web, etc.)
• No commented code blocks (use git history instead)
• Code follows team style guide and naming conventions

Checklist (Reviewer):

• Verified all Assignee checks above
• Code is well-organized, readable, and follows team standards
• Documentation is clear and sufficient
• Testing evidence reviewed (rosbags/videos/logs match claimed behavior)
• Changes tested/verified according to "Testing Status" section
• No obvious bugs, edge cases, or safety issues
• For infrastructure/deployment changes: rollback procedure is safe and clear