Limit output of pytest durations (#1393)

Durations output were previously increased to show all tests to allow us debugging of timeouts. However, now they have not been as important so limiting to only the 50 longer running tests is best to decrease log lengths, we may soon remove it entirely if they are not currently important.

Authors:
  - Peter Andreas Entschev (https://github.com/pentschev)

Approvers:
  - James Lamb (https://github.com/jameslamb)

URL: #1393

ci/test_python.sh

@@ -52,7 +52,7 @@ UCX_WARN_UNUSED_ENV_VARS=n \
 UCX_MEMTYPE_CACHE=n \
 timeout 60m pytest \
   -vv \
-  --durations=0 \
+  --durations=50 \
   --capture=no \
   --cache-clear \
   --junitxml="${RAPIDS_TESTS_DIR}/junit-dask-cuda.xml" \
@@ -73,7 +73,7 @@ UCX_WARN_UNUSED_ENV_VARS=n \
 UCX_MEMTYPE_CACHE=n \
 timeout 30m pytest \
   -vv \
-  --durations=0 \
+  --durations=50 \
   --capture=no \
   --cache-clear \
   --junitxml="${RAPIDS_TESTS_DIR}/junit-dask-cuda-legacy.xml" \