Add information about the total runtime of the test suite.

[drew2a]

This PR adds the total runtime of the test suite to the pytest output.
Related to #7132, #7134

The modified output:

src/tribler/core/components/metadata_store/restapi/tests/test_channels_endpoint.py::test_put_channel_thumbnail PASSED      [  5%] in 0.046s (2.9s in total)
src/tribler/core/components/metadata_store/restapi/tests/test_channels_endpoint.py::test_get_channel_contents PASSED       [  5%] in 0.082s (3.0s in total)
src/tribler/core/components/metadata_store/restapi/tests/test_channels_endpoint.py::test_get_popular_torrents PASSED       [  5%] in 0.090s (3.1s in total)
src/tribler/core/components/metadata_store/restapi/tests/test_channels_endpoint.py::test_get_channels_sort_by_health PASSED [  5%] in 0.087s (3.2s in total)
src/tribler/core/components/metadata_store/restapi/tests/test_channels_endpoint.py::test_add_torrent_invalid_uri PASSED    [  5%] in 0.234s (3.4s in total)
src/tribler/core/components/metadata_store/restapi/tests/test_channels_endpoint.py::test_get_channel_description PASSED    [  5%] in 0.042s (3.5s in total)
src/tribler/core/components/metadata_store/restapi/tests/test_channels_endpoint.py::test_get_channel_contents_remote PASSED [  5%] in 0.086s (3.5s in total)
src/tribler/core/components/metadata_store/restapi/tests/test_channels_endpoint.py::test_get_subscribed_channels PASSED    [  5%] in 0.084s (3.6s in total)
src/tribler/core/components/metadata_store/restapi/tests/test_channels_endpoint.py::test_get_my_channel_tags PASSED        [  5%] in 0.646s (4.3s in total)

For reference (The Hierarchy of hooks):

root
└── pytest_cmdline_main
 ├── pytest_plugin_registered
 ├── pytest_configure
 │ └── pytest_plugin_registered
 ├── pytest_sessionstart
 │ ├── pytest_plugin_registered
 │ └── pytest_report_header
 ├── pytest_collection
 │ ├── pytest_collectstart
 │ ├── pytest_make_collect_report
 │ │ ├── pytest_collect_file
 │ │ │ └── pytest_pycollect_makemodule
 │ │ └── pytest_pycollect_makeitem
 │ │ └── pytest_generate_tests
 │ │ └── pytest_make_parametrize_id
 │ ├── pytest_collectreport
 │ ├── pytest_itemcollected
 │ ├── pytest_collection_modifyitems
 │ └── pytest_collection_finish
 │ └── pytest_report_collectionfinish
 ├── pytest_runtestloop
 │ └── pytest_runtest_protocol
 │ ├── pytest_runtest_logstart
 │ ├── pytest_runtest_setup
 │ │ └── pytest_fixture_setup
 │ ├── pytest_runtest_makereport
 │ ├── pytest_runtest_logreport
 │ │ └── pytest_report_teststatus
 │ ├── pytest_runtest_call
 │ │ └── pytest_pyfunc_call
 │ ├── pytest_runtest_teardown
 │ │ └── pytest_fixture_post_finalizer
 │ └── pytest_runtest_logfinish
 ├── pytest_sessionfinish
 │ └── pytest_terminal_summary
 └── pytest_unconfigure

Refs:

• https://paragkamble.medium.com/understanding-hooks-in-pytest-892e91edbdb7
• https://docs.pytest.org/en/7.1.x/reference/reference.html