Filter data out from system databases for Azure SQL DB only (#8849)
Filter data out from system databases for Azure SQL DB only (#8849)

* Excluding data from system databases like msdb,model which are not
relevant for monitoring in Azure SQL

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* Addressing review comments to handle null scenarios
nferch/telegraf,Brightspace/telegraf,li-ang/telegraf,nferch/telegraf,Brightspace/telegraf,influxdata/telegraf,oldmantaiter/telegraf,li-ang/telegraf,Brightspace/telegraf,nferch/telegraf,oldmantaiter/telegraf,influxdata/telegraf,li-ang/telegraf,oldmantaiter/telegraf,influxdata/telegraf