Flow collector generates excessive logs for external site process flows

[ajssmith]

Describe the bug
The flow collector emits a log event when associating flows to external to site processes (server, client). A number of users have reported excessive logging/storage growth.

This log message was originally for dev/debug and does not otherwise provide informational value to the user. As such the log message should be removed.

Environment details

• Skupper : [1.8]