`power-management/light_sensor` test case can not work with remote test

### Bug Description

Executing the `power-management/light_sensor` remotely, the log of `monitor-sensor` can store part of them into the `light_sensor_test.log` and make the test case failed. However, all the logs can be stored while executing this test case locally.

remote test: https://certification.canonical.com/hardware/202501-36199/submission/456774/
local test: https://certification.canonical.com/hardware/202501-36199/submission/456773/

### Cert-blocker Test Case

- [ ] cert-blocker

### To Reproduce

Executing `power-management/light_sensor` test case

### Expected Result

The log of `monitor-sensor` can store to `light_sensor_test.log` correctly while executing it remotely.

### Actual Result

Only part of log can be stored.

### Environment

- OS: noble
- Checkbox type: debian
- Checkbox version: 7.0.0.dev26

### Relevant log output

```shell

```

### Additional context

_No response_

Start by comparing the linked remote and local submissions, then locate the power-management/light_sensor test and the handling of monitor-sensor output in light_sensor_test.log. Done means the complete monitor-sensor log is stored and the test passes when executed remotely, matching local behavior.

Written by the indexing model from the issue text.