refactor(anta): Use http head request to check_connection

[dlobato]

Description

Use HTTP HEAD request to check connection to a device instead of pure L3 check.
This allows to check connectivity on devices behind a reverse proxy, so rather than checking the reverse proxy is alive using HTTP the request will be forwarded to the right device.

The change is as close to the original as possible, but we could potentially check if the credentials are correct as well.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have run pre-commit for code linting and typing (pre-commit run)
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes (tox -e testenv)