[minor] Actually, don't report test durations (#13571)

This gets in the way more than I thought and has not inspired anyone to
make tests faster.

Author: hauntsaninja

test-data/unit/README.md

@@ -178,7 +178,7 @@ significantly decrease performance.
 
 To run tests with coverage:
 
-    python3 -m pytest --durations 100 --cov mypy --cov-config setup.cfg  --cov-report=term-missing:skip-covered --cov-report=html
+    python3 -m pytest --cov mypy --cov-config setup.cfg  --cov-report=term-missing:skip-covered --cov-report=html
 
 
 Debugging

tox.ini

@@ -16,7 +16,7 @@ isolated_build = true
 description = run the test driver with {basepython}
 passenv = PYTEST_XDIST_WORKER_COUNT PROGRAMDATA PROGRAMFILES(X86)
 deps = -rtest-requirements.txt
-commands = python -m pytest --durations 100 {posargs}
+commands = python -m pytest {posargs}
 
 [testenv:lint]
 description = check the code style