Fix/move icp tests to separate folder

[YoshuaNava]

Description

This PR separates the main file for libpointmatcher's unit tests (utest.cpp), from the existing ICP tests. The motivation being that, I have more ICP tests in implementation stage, and I see the potential to cover more facets of the algorithm.

Tests

All succeeding locally.

Instructions

I tested this locally with a ROS1 catkin build, by

1. Cloning libpointmatcher into a catkin workspace, along with the latest version of libnabo
2. Building with catkin build -DBUILD_TESTS=Enabled
3. Executing the tests from the catkin workspace folder with $ ./build/libpointmatcher/utest/utest --path <path_to_workspace>/src/libpointmatcher/examples/data/

[pomerlef]

Add to whitelist

[YoshuaNava]

Hi @pomerlef,
There is a message saying that all checks have failed, but no tests were run:

What could be the issue? I also see it in #508

[YoshuaNava]

Hi @pomerlef,
Sorry to bother. I wanted to catch up on the status of this MR, and your thoughts on it.

Thank you in advance 🙏

[pomerlef]

Looks good on my side

[YoshuaNava]

Thank you!

About the pipeline, it doesn't seem to be running atm:

Is there any way I could trigger it?

[pomerlef]

The CI tool setup by ASL seems out of order. I need to set up a local machine to validate the modification. Once it is done, I'll start processing the PRs.

[YoshuaNava]

Oki 👍

[pomerlef]

This was manually merged into master.