Don't log table discovery results if nothing changed

[pivovarit]

Table discovery logs keep popping up every now and then even when nothing has changed. We should log initial values, and then log only if something has changed - all other results should be logged at DEBUG level

kibana-sample-data-quesma-1          | ... Table discovery results: configured=[kibana_sample_data_ecommerce,kibana_sample_data_flights,logs-generic-default], found but not configured=[], explicitly disabled=[]
kibana-sample-data-quesma-1          | ... Table discovery results: configured=[kibana_sample_data_ecommerce,kibana_sample_data_flights,logs-generic-default], found but not configured=[], explicitly disabled=[]
kibana-sample-data-quesma-1          | ... Table discovery results: configured=[kibana_sample_data_ecommerce,kibana_sample_data_flights,logs-generic-default], found but not configured=[], explicitly disabled=[]