[6.15.z] Use server_config as named argument only

[Satellite-QE]

Cherrypick of PR: #1152

Description of changes

Update all entity initialization calls to pass server_config as a named kwarg instead of as a positional arg.

Fixes #1038

pytest_fixtures/component/taxonomy.py:43: in module_org
    return module_target_sat.api.Organization().create()
../../lib64/python3.12/site-packages/nailgun/entities.py:5803: in create
    return type(self)(
E   TypeError: Organization.__init__() got multiple values for argument 'server_config'

Functional demonstration

nailgun tests:

# make test
python -m unittest discover --start-directory tests --top-level-directory .
................................................................................................................................................................................................................................................................................
----------------------------------------------------------------------
Ran 272 tests in 5.584s

OK

robottelo tests:

$ pytest tests/foreman/api/test_organization.py 
[...]
tests/foreman/api/test_organization.py ...........................................     [100%]
=== 43 passed, 175 warnings in 215.71s (0:03:35) ===

robottelo PRT:
job/robottelo-pr-testing/7142/console:

10:45:45  ================= 43 passed, 237 warnings in 812.40s (0:13:32) =================

Additional Information