tests: Add board qualification tests for user LEDs.

[nedseb]

Description

Add board qualification tests for the user RGB LED and BLE LED on the STeaMi board.

Components

LED	Pin name	STM32WB55 Pin
RED	LED_RED	PC12
GREEN	LED_GREEN	PC11
BLUE	LED_BLUE	PC10
BLE	LED_BLE	PH3

Scenario: tests/scenarios/board_leds.yaml

Tests

1. LED RED on/off — turn on for 1s, turn off
2. LED RED visible — manual confirmation
3. LED GREEN on/off — turn on for 1s, turn off
4. LED GREEN visible — manual confirmation
5. LED BLUE on/off — turn on for 1s, turn off
6. LED BLUE visible — manual confirmation
7. RGB LED full cycle — R → G → B → white (all on), each 500ms
8. RGB LED cycle visible — manual confirmation
9. LED BLE on/off — turn on for 1s, turn off
10. LED BLE visible — manual confirmation

All tests use hardware_script + manual actions (hardware mode only).

Depends on

• tests: Extend test framework for driverless board qualification scenarios. #83 (framework extension for `type: board` scenarios)