skip node reconciliation to delete leaked ENIs on un-managed nodes

[sushrk]

Issue #, if available:
N/A

Description of changes:
Skip node reconciliation to delete leaked branch ENIs on un-managed nodes. This unnecessarily re-queues node for reconciliation and results in repeating logs like-

{"level":"info","timestamp":"2024-11-22T00:06:42.703Z","logger":"node manager","msg":"reconciled cleanup node for leaking branch interfaces","NodeName":"ip-192-168-115-168.us-west-2.compute.internal","NextInterval":60,"NextReconciliationTime":"2024-11-22T00:07:42.703Z"}
{"level":"info","timestamp":"2024-11-22T00:08:41.963Z","logger":"branch eni provider","msg":"no trunk ENI is pointing to the given node","node":"ip-192-168-115-168.us-west-2.compute.internal","nodeName":"ip-192-168-115-168.us-west-2.compute.internal"}
{"level":"info","timestamp":"2024-11-22T00:08:41.963Z","logger":"node manager","msg":"reconciled cleanup node for leaking branch interfaces","NodeName":"ip-192-168-115-168.us-west-2.compute.internal","NextInterval":60,"NextReconciliationTime":"2024-11-22T00:09:41.963Z"}
{"level":"info","timestamp":"2024-11-22T00:08:41.963Z","logger":"branch eni provider","msg":"no trunk ENI is pointing to the given node","node":"ip-192-168-157-180.us-west-2.compute.internal","nodeName":"ip-192-168-157-180.us-west-2.compute.internal"}
{"level":"info","timestamp":"2024-11-22T00:08:41.963Z","logger":"node manager","msg":"reconciled cleanup node for leaking branch interfaces","NodeName":"ip-192-168-157-180.us-west-2.compute.internal","NextInterval":60,"NextReconciliationTime":"2024-11-22T00:09:41.963Z"}

Also cleaning up some log statements to help debug issues faster.

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