Fix get node health call

[vicky-g]

Description

This PR is to:

• pass in the self content node endpoint to prevent a node from rolling itself off of a replica set
• refactor code slightly
• query the regular health check, not the verbose health check

Tests

• adjusted the unit tests

Monitoring - How will this change be monitored? Are there sufficient logs / alerts?

Since there aren't any functionality changes (except for the code where the tests were modified), the existing logs should suffice. See logs surrounding isNodeHealthy()