What do these changes do?

This PR addresses the failure of performance tests to run in the CI environment after an e2e upgrade in Python.

• Dependency Injection: Adjusted .env generation as make config was producing an empty file. Now, dependencies are injected into locust_settings.py using uv add --script ..., allowing it to run as a standalone script.
• CLI Argument Fix: Corrected cut command arguments to ensure proper execution
• Environment Variable Validation: Added initial checks for additional required environment variables.

Related issue/s

• portal e2e failures since docker:latest updated and installs new version of python

How to test

Dev-ops

None