coverage reports for the tests that run on the mcu

Description:
The initial test now runs on the MCU (using _puts_PF), with the results printed to stdout. However, we also aim to gather coverage information from these runs. We want to focus on obtaining coverage information solely for _puts_PF first to implement this solution effectively.

Additionally, consider referring to the following approach for guidance: [link](https://splichal.eu/gccsphinx-final/html/gcc/gcov/profiling-and-test-coverage-in-freestanding-environments.html).

User Story:
As a developer working on the MCU tests, I expect to collect coverage information specifically to enhance our testing process.