ci: Remove unused EXPECTED_TESTS_DURATION_IN_SECONDS env var

ci/test/00_setup_env.sh

@@ -45,7 +45,6 @@ export RUN_SECURITY_TESTS=${RUN_SECURITY_TESTS:-false}
 export TEST_RUNNER_TIMEOUT_FACTOR=${TEST_RUNNER_TIMEOUT_FACTOR:-40}
 export TEST_RUNNER_ENV=${TEST_RUNNER_ENV:-}
 export RUN_FUZZ_TESTS=${RUN_FUZZ_TESTS:-false}
-export EXPECTED_TESTS_DURATION_IN_SECONDS=${EXPECTED_TESTS_DURATION_IN_SECONDS:-1000}
 
 export CONTAINER_NAME=${CONTAINER_NAME:-ci_unnamed}
 export CI_IMAGE_NAME_TAG=${CI_IMAGE_NAME_TAG:-ubuntu:20.04}