tests: Add test scenario for LIS2MDL magnetometer.

[nedseb]

Add a YAML test scenario file tests/scenarios/lis2mdl.yaml for the LIS2MDL driver.

Expected tests

• Mock: verify device ID register (WHO_AM_I)
• Hardware: read magnetometer X, Y, Z values
• Manual: validate displayed magnetic field values

Reference

• Driver: lib/lis2mdl/
• Test framework: PR tests: add test framework with mock and hardware support. #28

[semantic-release-updater]

🎉 This issue has been resolved in version 0.0.2 🎉

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