Header loading text order

I'm trying to customize the test header:

$ pytest
=================================================================== test session starts ===================================================================
platform linux -- Python 3.10.13, pytest-8.1.1, pluggy-1.4.0
rootdir: /home/ubuntu/pymapdl
configfile: pyproject.toml
testpaths: tests
plugins: cov-4.1.0, anyio-4.3.0, sphinx-0.6.0, pytest_pyvista-0.1.9, rerunfailures-14.0, memprof-0.2.0

by modifying this function:

@pytest.hookimpl(trylast=True)
def pytest_report_header(config, start_path, startdir):
    return "Useful reports"

However the platform linux ... get always first, which is annoying, and, in my humble opinion, it is a bug.

$ pytest
=================================================================== test session starts ===================================================================
platform linux -- Python 3.10.13, pytest-8.1.1, pluggy-1.4.0
Useful reports
rootdir: /home/ubuntu/pymapdl
configfile: pyproject.toml
testpaths: tests
plugins: cov-4.1.0, anyio-4.3.0, sphinx-0.6.0, pytest_pyvista-0.1.9, rerunfailures-14.0, memprof-0.2.0

I'm happy to do a PR on this if this issue feedback is positive.

Start by tracing the pytest_report_header hook shown in the issue and the session-header output produced by the sample pytest invocation. Reproduce the ordering with a hook returning “Useful reports,” then inspect the header-generation path to determine how the platform line is positioned. Done means the custom header appears in the requested order and the existing header output remains covered by tests.