chore: Remove Karpenter noodepool (#402)

**Reason for Change**:
After a conversation with Karpenter Azure Provider team, the nodepool
API is not needed anymore.

**Requirements**

- [ ] added unit tests and e2e tests (if applicable).

**Issue Fixed**:
<!-- If this PR fixes GitHub issue 4321, add "Fixes #4321" to the next
line. -->

**Notes for Reviewers**:

Signed-off-by: Heba Elayoty <hebaelayoty@gmail.com>