Revert "Tests: Enable coverage measurement in subprocesses started by execute_pwb()"

This reverts commit c13928c.

Reason for revert: no improvements

Change-Id: Ib48240b5e2c47b1db6448ef98fdbf7d3fb850d1a

Author: xqt

.github/workflows/doctest.yml

@@ -68,7 +68,6 @@ jobs:
           coverage run -m pytest pywikibot --doctest-modules --ignore-glob="*gui.py" --ignore-glob="*memento.py"
       - name: Show coverage statistics
         run: |
-          coverage combine
           coverage report
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v5

.github/workflows/login_tests-ci.yml

@@ -124,7 +124,6 @@ jobs:
           coverage run -m unittest -vv tests/site_login_logout_tests.py
       - name: Show coverage statistics
         run: |
-          coverage combine
           coverage report
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v5

.github/workflows/oauth_tests-ci.yml

@@ -102,7 +102,6 @@ jobs:
           coverage run -m unittest -vv
       - name: Show coverage statistics
         run: |
-          coverage combine
           coverage report
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v5

.github/workflows/pywikibot-ci.yml

@@ -140,7 +140,6 @@ jobs:
           fi
       - name: Show coverage statistics
         run: |
-          coverage combine
           coverage report
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v5

.github/workflows/sysop_write_tests-ci.yml

@@ -62,7 +62,6 @@ jobs:
           coverage run -m pytest -s -r A -a "${{ matrix.attr }}"
       - name: Show coverage statistics
         run: |
-          coverage combine
           coverage report
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v5

.github/workflows/windows_tests.yml

@@ -75,7 +75,6 @@ jobs:
           coverage run -m unittest discover -vv -p \"*_tests.py\";
       - name: Show coverage statistics
         run: |
-          coverage combine
           coverage report
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v5

tests/utils.py

@@ -530,12 +530,6 @@ def execute_pwb(args: list[str], *,
     else:
         command.append(_pwb_py)
 
-    # Test is running; activate coverage if present
-    if os.environ.get('PYWIKIBOT_TEST_RUNNING', '0') == '1':
-        with suppress(ModuleNotFoundError):
-            import coverage  # noqa: F401
-            command = [command[0], '-m', 'coverage', 'run'] + command[1:]
-
     return execute(command=command + args, data_in=data_in, timeout=timeout)