Remove CUDA_LAUNCH_BLOCKING from Lite tests (#16177)

Author: carmocca

.azure/gpu-tests-lite.yml

@@ -96,7 +96,6 @@ jobs:
     - bash: python -m coverage run --source lightning_lite -m pytest --ignore benchmarks -v --junitxml=$(Build.StagingDirectory)/test-results.xml --durations=50
       env:
         PL_RUN_CUDA_TESTS: "1"
-        CUDA_LAUNCH_BLOCKING: "1"
       workingDirectory: tests/tests_lite
       displayName: 'Testing: Lite standard'
       timeoutInMinutes: "10"