Add arcDiscovery & discoverySource Props to the SqlServerV2 and SqlDatabaseV2.

[santoshatmicrosoft]

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API Change Check

APIView identified API level changes in this PR and created the following API reviews

Language	API Review for Package
Swagger	Microsoft.Migrate-Microsoft.OffAzure
Go	sdk/resourcemanager/migrationdiscovery/armmigrationdiscovery
Go	sdk/resourcemanager/migrate/armmigrate
JavaScript	@azure/arm-migrationdiscovery
JavaScript	@azure/arm-migrate
Python	azure-mgmt-migrationdiscovery_python.json
Python	azure-mgmt-migrate_python.json

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