Add env var and env config source integration tests #1108
Merged
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In reconciling #1058 and #1099 it is helpful to understand the current behavior. These changes add two integration tests (thanks to @pmcollins for the approach) that demonstrate what the behavior from 0.37.0+ has been. Deletes the previous version of this test since the config server is unreliable for core config parsing.
Also including testutils resource metrics string improvements since their output is unfortunate to say the least and yaml marshalling is repeatable. Without these changes debugging these added tests is difficult.