fix: remove guest agent before sysprep to run windows cse on hub

[christinalau0]

Reason for Change:

Hub requires a fixed version of guest agent. When building the VHD, the Azure VM's guest agent must be removed before running sysprep, so that the created VM on Hub can run the windows CSE.

Issue Fixed:

Credit Where Due:

Does this change contain code from or inspired by another project?

• [x] No
• [ ] Yes

If "Yes," did you notify that project's maintainers and provide attribution?

• [ ] No
• [ ] Yes

Requirements:

• [x] uses conventional commit messages
• [ ] includes documentation
• [ ] adds unit tests
• [ ] tested upgrade from previous version

Notes: