Fix flaky test_namespace_create_and_delete[v3]

[jerabekjiri]

No-Issue

https://github.com/ansible/galaxy_ng/actions/runs/7171839578/job/19529139780?pr=2003#step:8:1344

=================================== FAILURES ===================================
_____________________ test_namespace_create_and_delete[v3] _____________________

api_version = 'v3'
galaxy_client = <bound method GalaxyKitClient.gen_authorized_client of <galaxy_ng.tests.integration.utils.iqe_utils.GalaxyKitClient object at 0x7fe17effc490>>

    @pytest.mark.galaxyapi_smoke
    @pytest.mark.namespace
    @pytest.mark.parametrize(
        "api_version",
        [
            'v3',
            '_ui/v1'
        ]
    )
    @pytest.mark.all
    def test_namespace_create_and_delete(api_version, galaxy_client):
        """Tests whether a namespace can be created and deleted"""
    
        # http://192.168.1.119:8002/api/automation-hub/_ui/v1/namespaces/
        # http://192.168.1.119:8002/api/automation-hub/v3/namespaces/
        # {name: "testnamespace1", groups: []}
        gc = galaxy_client("partner_engineer")
        new_namespace = f"ns_test_{generate_random_string()}"
        payload = {'name': new_namespace, 'groups': []}
        resp = gc.post(f"{api_version}/namespaces/", body=payload)
        assert resp['name'] == new_namespace
        if api_version == "v3":
            get_namespace(gc, new_namespace)
            gc.delete(f"{api_version}/namespaces/{new_namespace}/", parse_json=False)
>           with pytest.raises(KeyError):
E           Failed: DID NOT RAISE <class 'KeyError'>

galaxy_ng/tests/integration/api/test_namespace_management.py:46: Failed

Fix by waiting for namespace metadata tasks to finish.