Output verbosity for test cases

[plannigan]

This is a follow on to fine-grained output verbosity for assertions (#11387/#11473). The next "category" that seems to stand out based on the current behavior is how pytest displays test cases are it executes them. By this I mean the distinction between:

--quiet

................................................................................. [  2%]
................................................................................. [  4%]
<truncated>

vs

default

testing/acceptance_test.py .....                                                  [  0%]
testing/deprecated_test.py ..........                                             [  0%]
testing/test_argcomplete.py ..                                                    [  0%]
<truncated>

vs

--verbose

testing/acceptance_test.py::TestGeneralUsage::test_docstring_on_hookspec PASSED [  0%]
testing/acceptance_test.py::TestInvocationVariants::test_invoke_with_invalid_type PASSED [  0%]
testing/acceptance_test.py::TestInvocationVariants::test_invoke_plugin_api PASSED [  0%]
testing/acceptance_test.py::TestInvocationVariants::test_core_backward_compatibility PASSED [  0%]
<truncated>

Additionally, I think this would also extend to the output of --collect-only (doesn't show all of the states):

--quiet --quiet

testing/_py/test_local.py: 183
testing/acceptance_test.py: 84
testing/code/test_code.py: 17
<truncated>

vs

default

testing/acceptance_test.py::TestGeneralUsage::test_docstring_on_hookspec
testing/acceptance_test.py::TestInvocationVariants::test_invoke_with_invalid_type
testing/acceptance_test.py::TestInvocationVariants::test_invoke_plugin_api
testing/acceptance_test.py::TestInvocationVariants::test_core_backward_compatibility
<truncated>

---

There doesn't seem to be an existing name for this, so I plan to start the work using test_case. If someone comes up with a better name, I'd be happy to use that. I don't think there would be anything else that would fit into this "category". But feel free to bring things to my attention if I missed something.