[IMP] hr_org_chart: Adapt module with new hr.employee.public model

addons/hr_org_chart/controllers/hr_org_chart.py

addons/hr_org_chart/models/__init__.py

addons/hr_org_chart/models/hr_employee.py

addons/hr_org_chart/models/hr_org_chart_mixin.py

addons/hr_org_chart/static/src/js/hr_org_chart.js

addons/hr_org_chart/static/src/xml/hr_org_chart.xml

addons/hr_org_chart/static/tests/hr_org_chart_tests.js

addons/hr_org_chart/views/hr_views.xml