tests: Add test scenario for WSEN-HIDS humidity sensor.

[nedseb]

Add a YAML test scenario file tests/scenarios/wsen-hids.yaml for the WSEN-HIDS driver.

Expected tests

• Mock: verify device ID register
• Hardware: read humidity and temperature
• Manual: validate displayed sensor values

Reference

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