🧪 Add tests for metrics utility functions

[alfieprojectsdev]

This PR adds comprehensive unit tests for the utility functions in services/vadase-rt-monitor/src/utils/metrics.py.

🎯 What: Addressed the lack of tests for compute_horizontal_magnitude and other related metrics functions.
📊 Coverage:

• compute_horizontal_magnitude: Basic cases, zeros, negatives, single component, and float precision.
• compute_3d_magnitude: 1-1-1 case, 3-4-12 case, and zeros.
• convert_m_to_mm & convert_mm_to_m: Conversion accuracy and edge cases.
  ✨ Result: Improved reliability and test coverage for core monitoring calculations.

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PR created automatically by Jules for task 2097731109998008477 started by @alfieprojectsdev

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[alfieprojectsdev]

Closing: superseded by #20 (already merged) which covers all 4 metrics functions.

[google-labs-jules]

Closing: superseded by #20 (already merged) which covers all 4 metrics functions.

Understood. Acknowledging that this work is now obsolete as it has been superseded by #20, which already covers the metrics functions. Stopping work on this task.