chore(pytest): update multiprocessing coverage integration

Based on:

https://github.com/pytest-dev/pytest-cov/blob/v7.0.0/docs/subprocess-support.rst

After fixing the source path entries (`unblob` package moved under the
`python/` directory when merged with `unblob-native`), coverage
measurement "just works"

Author: vlaci

pyproject.toml

@@ -151,7 +151,7 @@ parametrize-names-type = "csv"
 "attr".msg = "Use `attrs` (with an 's') instead"
 
 [tool.pytest.ini_options]
-addopts = "--cov=unblob --cov=tests --cov-branch --cov-fail-under=90"
+addopts = "--cov --cov-fail-under=90"
 norecursedirs = """
   *.egg
   *_extract
@@ -162,15 +162,10 @@ norecursedirs = """
   tests/integration
 """
 
-[tool.coverage.paths]
-source = ["tests", "unblob"]
-
 [tool.coverage.run]
 branch = true
 concurrency = ["multiprocessing"]
-parallel = true
-sigterm = true
-source = ["tests", "unblob"]
+source = ["python", "tests"]
 
 [tool.coverage.report]
 fail_under = 90

python/unblob/testing.py

@@ -9,7 +9,6 @@
 import pytest
 from lark.lark import Lark
 from lark.visitors import Discard, Transformer
-from pytest_cov.embed import cleanup_on_sigterm
 
 from unblob.finder import build_hyperscan_database
 from unblob.logging import configure_logger
@@ -24,9 +23,6 @@ def configure_logging(tmp_path_factory):
     log_path = tmp_path_factory.mktemp("logs") / "unblob.log"
     configure_logger(verbosity_level=3, extract_root=extract_root, log_path=log_path)
 
-    # https://pytest-cov.readthedocs.io/en/latest/subprocess-support.html#if-you-use-multiprocessing-process
-    cleanup_on_sigterm()
-
 
 def gather_integration_tests(test_data_path: Path):
     # Path.glob() trips on some invalid files