chore: Clean up unused files, imports, and work on getting end-to-end tests and unit tests running (#2272)

docs/v2/services/default/measurements.md

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+# Service: Measurements
+
+...
+
+## Usage
+
+## How to define a Measurement tool
+
+## How to validate Measurements
+
+## Data exchange concepts
+
+## Longitudinal Measurements
+
+## Timepoints