Add python unit tests coverage to github actions

[GGP1]

Description

As part of every release testing, we are calculating the python unit tests coverage manually by executing one of our internal scripts. This has caused us some issues as the results rely on the environment where they are executed, resulting in different coverages depending on who did the tests.

To avoid this and to automate the process, we could edit our existing unit tests (adding --cov to the tests command) and have this information in our workflow.

Checks

The following elements have been updated or reviewed (should also be checked if no modification is required):

• Tests (unit tests, API integration tests).
• Changelog.
• Documentation.
• Integration test mapping (using api/test/integration/mapping/_test_mapping.py).

[GGP1]

Update

Added the pytest_coverage internal script to the QA integration framework and created a github action to obtain python unit tests coverage on demand.

[Selutario]

Reopening since it was automatically closed after merging wazuh/qa-integration-framework#168

[GGP1]

Update

Added coverage reporting in the existing Python unit tests.