[Stateless CNI] Improve logs sent via CNI Telemetry Sidecar

Following #3824, we need improvements to send additional information that are helpful in troubleshooting CNI-related issues that reveal the behaviour of CNI and not just the happy path for ADD/DELETE. There should also be a way to identify the CNI binary that is executing when initializing.

Start by reading #3824 and locating the Stateless CNI Telemetry Sidecar plus its ADD/DELETE and initialization entry points. Determine which troubleshooting information is needed for non-happy-path CNI behavior and how to identify the executing CNI binary; the issue names no files or tests, so completion criteria need clarification.

Written by the indexing model from the issue text.