Add ScanServerIT for testing resource groups

[ddanielr]

A IT test should be added for testing the scan profiles and verifying that scans are hitting the correct scan server based on the specified scan hint and correctly defined accumulo-client.properties.

https://github.com/apache/accumulo/blob/main/core/src/main/java/org/apache/accumulo/core/spi/scan/ConfigurableScanServerSelector.java#L152