Add test alias and test node name to elementary test results

[IDoneShaveIt]

dbt allows you to configure a custom name for test. In this PR I added test alias and test node name to elementary test results table so we would be able to extract the custom name in the CLI.

The graph doesn't contains the custom name param, and the way to retrieve it is to see if the alias and the name fields of the test node are equal. If so, it means that the user provided a custom name for the test.