Enable coverage in CI for Linux (#369)

Author: vlad-perevezentsev

.coveragerc

@@ -2,4 +2,4 @@
 plugins = Cython.Coverage
 branch = True
 source = dpctl
-omit = dpctl/tests/*, *__init__.py
+omit = dpctl/tests/*, dpctl/_version.py

conda-recipe/run_test.sh

@@ -6,4 +6,4 @@ set -e
 source ${ONEAPI_ROOT}/compiler/latest/env/vars.sh || true
 
 ${PYTHON} -c "import dpctl"
-pytest -q -ra --disable-warnings --pyargs dpctl -vv
+pytest -q -ra --disable-warnings --cov dpctl --cov-report term-missing --pyargs dpctl -vv