Properly handle errors when setting pixformat

[cnadler86]

Description

This PR add proper handle of sensor.set_pixformat return values in order to throw an error, if the function didn't return a non-error value. To do so, a new ESP_ERR_CAMERA_FAILED_TO_SET_PIXEL_FORMAT was added.

Related

None

Testing

I tested it with omnivision sensors with a ESP32S3 with IDF 5.4.2

---

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.