Fix feature-db setup script with new dump

[c-w]

A few changes were necessary to make this work with Tim's latest dump:

1. Remove some extension points (user name, database name) as the dump assumes them
2. Export two connection strings since the dump assumes two users being set up

Verified that the script runs without issues like so:

# these are normally be set by the fortis-deploy.sh script, setting manually for testing
region='EastUS'
resource_group='clewolff-test-db'

# call the script to create and populate the feature-db
# this takes ~30 minutes to download the database dump and a few hours to populate the db
. ./install-feature-service-db.sh "$region" "$resource_group"

# verify the connection strings; normally these would be stored in the cluster config map
echo "$FEATURE_SERVICE_DB_CONNECTION_STRING"
echo "$FEATURE_SERVICE_DB_CONNECTION_STRING_2"

[erikschlegel]

LGTM

[c-w]