Refactor live tests for speed

```
=========================================================================== slowest 20 durations ============================================================================
31.38s call tests/test_api.py::test_api_with_requirement_file
22.70s call tests/test_resolution.py::test_without_supported_wheels
16.58s call tests/test_cli.py::test_pdt_output_with_frozen_requirements
13.41s call tests/test_cli.py::test_pdt_output_with_pinned_requirements
12.69s call tests/test_resolution.py::test_get_resolved_dependencies_with_flask_and_python_36
8.87s call tests/test_cli.py::test_cli_with_azure_devops_with_python_313
8.73s call tests/test_cli.py::test_cli_with_single_index_url_except_pypi_simple
8.09s call tests/test_resolution.py::test_get_resolved_dependencies_with_flask_and_python_310
7.98s call tests/test_resolution.py::test_get_resolved_dependencies_with_flask_and_python_310_windows
7.56s call tests/test_cli.py::test_cli_with_azure_devops_with_python_310
7.29s call tests/test_cli.py::test_cli_with_azure_devops_with_python_38
6.34s call tests/test_cli.py::test_cli_with_pinned_requirements_file
3.54s call tests/test_cli.py::test_cli_with_requirements_and_ignore_errors
2.83s call tests/test_cli.py::test_cli_with_environment_marker_and_complex_ranges
2.83s call tests/test_api.py::test_api_with_prefer_source
2.74s call tests/test_api.py::test_api_with_specifier_pdt
2.73s call tests/test_api.py::test_api_with_specifier
2.64s call tests/test_api.py::test_api_with_python_311
2.62s call tests/test_api.py::test_api_with_recursive_requirement_file
2.28s call tests/test_resolution.py::test_get_resolved_dependencies_with_tilde_requirement_using_json_api

```

... we can do better!