Add missing type hints - Part 2 (#4801)

* add typehints to tests.inspection

* change several yield statements in fixtures to return

* add typehints to tests.installation.test_chef, tests.installation.test_chooser, tests.installation.test_executor

* add typehints to tests.installation.test_installer

* add typehints to tests.installation.test_installer_old

* add typehints to tests.installation.test_pip_installer

* add typehints to tests.masonry

* add typehints to tests.mixology

* add typehints to tests.packages

* add typehints to tests.plugins