refactor(device): Update info about Github, Gitlab runner setup

[peter-marcisovsky]

Description

This MR updates CI target runner setup README with recent findings from applying the Docker workaround for accessing USB devices on GitLab runners.

It was found out, that the plugdev group is not avaliable on GitLab runners, thus the docker container is run without it. Also removing it from there.

Related

• follow-up for ci(esp_tinyusb): Run esp_tinyusb test apps in CI on esp32s2 runner #75

Testing

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Checklist

Before submitting a Pull Request, please ensure the following:

• 🚨 This PR does not introduce breaking changes.
• All CI checks (GH Actions) pass.
• Documentation is updated as needed.
• Tests are updated or added as necessary.
• Code is well-commented, especially in complex areas.
• Git history is clean — commits are squashed to the minimum necessary.

[erhankur]

@peter-marcisovsky thanks. LGTM

[roma-jam]

LGTM!