ci: Fix disconnected tests

[christinalau0]

Reason for Change:

• Increase disconnected pipeline's API model Windows osDiskSizeGB to 50. This is to prevent disk usage from going over threshold, which causes kubelet to remove containerd images.
• Fix control plane and linux node test cases. They create an init container which tests outbound connection. In disconnected pipeline, there is no outbound connection so the init container will fail. Created separate job yaml's for no-egress case.
• Change outbound connection test case to use a pod instead of ssh connection, since port 22 is disabled in our CI.

Issue Fixed:

Credit Where Due:

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

• No
• Yes

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

• No
• Yes

Requirements:

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

Notes:

[christinalau0]

Verified successful run with ADO Test VHD No Egress pipeline.

[christinalau0]

Verified successful run with ADO E2E PR pipeline as well.