fix(config): test for completeness of config telemetry #4941
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What does this PR do?
Adds a test that verifies completeness of config telemetry by comparing directly against config_norm_rules.json. If a config key does not exist there, it is not processed by our telemetry backend. This is in-line with what we have in dd-trace-dotnet
This PR is open for review, but will not be merged in until the test passes (ie. all telemetry values are handled). We have. a Google sheet tracking proposed decisions (keep/ignore) and normalized config names
Motivation
Telemetry was thought to have been missing from our backend and it wasn't discovered until today. On adding this test, it appears that 118 (maybe less) config telemetry keys are missing
Current missing telemetry keys
Plugin Checklist
Additional Notes
This is my first PR in this repo and I'm pretty rusty in Node.js - please give me all of your nit picks!