Add onroad camera screenshots

[TheSecurityDev]

Implements the onroad screenshots for raylib that were in the old UI test previews.

Doesn't include the alerts, but that will be easy to add next (#36353)

[Copilot]

Pull Request Overview

This PR implements onroad camera screenshots for the raylib UI test framework, expanding the existing offroad test coverage to include driving scenarios. This allows testing of the UI while openpilot is actively running with camera feeds.

• Adds onroad test scenarios including engaged, disengaged, override, and wide camera modes
• Implements camera frame loading and caching system for test data
• Integrates VisionIpcServer to simulate real camera feeds during testing

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[github-actions]

raylib UI Preview

driver_camera : $${\color{cyan}\text{NEW}}$$

homescreen : $${\color{red}\text{DIFFERENT}}$$

master	proposed
diff	composite diff

homescreen_paired : $${\color{red}\text{DIFFERENT}}$$

master	proposed
diff	composite diff

homescreen_prime : $${\color{red}\text{DIFFERENT}}$$

master	proposed
diff	composite diff

homescreen_update_available : $${\color{red}\text{DIFFERENT}}$$

master	proposed
diff	composite diff

offroad_alert : $${\color{red}\text{DIFFERENT}}$$

master	proposed
diff	composite diff

onroad : $${\color{cyan}\text{NEW}}$$

onroad_disengaged : $${\color{cyan}\text{NEW}}$$

onroad_override : $${\color{cyan}\text{NEW}}$$

onroad_sidebar : $${\color{cyan}\text{NEW}}$$

onroad_wide : $${\color{cyan}\text{NEW}}$$

onroad_wide_sidebar : $${\color{cyan}\text{NEW}}$$

settings_firehose : $${\color{red}\text{DIFFERENT}}$$

master	proposed
diff	composite diff

All Screenshots

[TheSecurityDev]

It looks like the changes to the UI (signal strength and firehose active -> inactive) were like this in the old screenshots.

To fix the Firehose page, we can set deviceState.networkMetered = False, if that's what we want.