Exclude headers with SYCL kernels from the coverage report (#2623)

The PR excludes the headers files under
`backend/kernels/elementwise_functions` from the coverage report,
because there is no way to cover structures used inside the SYCL
kernels.

Author: antonwolfy

.github/workflows/generate_coverage.yaml

@@ -135,7 +135,7 @@ jobs:
             conda activate coverage
             [ -f /opt/intel/oneapi/setvars.sh ] && source /opt/intel/oneapi/setvars.sh
             git clean -fxd
-            python scripts/gen_coverage.py --verbose
+            python scripts/gen_coverage.py
 
       - name: Total number of coverage attempts
         run: |

scripts/gen_coverage.py

@@ -100,7 +100,6 @@ def run(
             "term-missing",
             "--pyargs",
             "dpnp",
-            "-vv",
             *pytest_opts.split(),
         ],
         cwd=setup_dir,
@@ -109,8 +108,6 @@ def run(
     )
 
     def find_objects():
-        import os
-
         objects = []
         dpnp_path = os.getcwd()
         search_path = os.path.join(dpnp_path, "dpnp")
@@ -146,6 +143,7 @@ def find_objects():
                 "export",
                 "-format=lcov",
                 "-ignore-filename-regex=/tmp/icpx*",
+                r"-ignore-filename-regex=.*/backend/kernels/elementwise_functions/.*\.hpp$",
                 "-instr-profile=" + instr_profile_fn,
             ]
             + objects