Improved integration tests

[LucasJSch]

Overview

This PR improves integration tests in the following ways:

• Adds RGB front-camera and down-camera image comparison to ground truth images. This provides a really useful feedback into potential regression or functional changes, since the similarity score of images has a very high threshold, and is sensitive to relevant drone kinematic changes.
  The ground truth image files were added in this PR, along with the script to generate these images in case we want to generate more or different images.
• Implementation of image_validation_utils.py for computing image comparisons.
• Added a few jsonc files to use in the test_hello_drone.py file.
• Corrections and improvements for test_api_services.py
• File name corrections
• Added sensors value computations in test_sensor_apis.py

This is a continuation of #150, and part of a long-term effort to strengthen, improve, and standardize the way we develop, test, and maintain ProjectAirSim.

[github-actions]

❌ ProjectAirSim Self-Hosted CI

• Status: failure
• Pytest results: tests=166, failures=3, errors=26, skipped=0
• Artifacts: test-results

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