Drain refactor to handle complex cluster types

[ipetrov117]

Refactor drain to handle the following scenarios:

1. Do not do drains for single and 1 control-plane/ 1 worker clusters
2. Do control-plane only drain for N control-plane/ 1 worker clusters, where N>1
3. Do worker only drain for 1 control-plane/ N worker clusters, where N>1
4. Do drain for both control-plane and worker nodes when cluster is N control-plane/ N worker, where N>1
5. Offer users the option to disable the drain for control-plane and/or worker nodes from

Test matrix:

• Do not do drains on single clusters
• Do not do drains for 1 control-plane/ 1 worker clusters
• Manually enable drains for small clusters (at user's risk)
• Do drain for N control-plane/ 1 worker, where N>1
• Do drain for 1 control-plane/ N workers, where N>1
• Do drain for N control-plane/ N worker, where N>1
• Disable drain for control-plane/worker nodes for N control-plane/ N worker clusters