Add test suite for Metrics page: Querying

[jescalada]

Metrics is a really massive app, so we are dividing it into pieces. Here, we will test the Querying functionality:

• Ensure that different types of queries return expected rows in the Table
• Ensure that different types of queries return expected graphs
• Ensure that errors display on invalid queries

More cases can be added if necessary! 🙏🏻