chore: remove container monitoring addon

[christinalau0]

Reason for Change:

The container monitoring addon on AKS Engine has been deprecated by Azure Monitor team for a while. This PR removes the code for container monitoring addon in AKS Engine repo.

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:

[christinalau0]

Validated with obp pr-e2e pipeline.

[jadarsie]

/azp run

[azure-pipelines[bot]]

Azure Pipelines successfully started running 1 pipeline(s).