PYTHON-4504 Use a venv for mod_wsgi test (#1687)

(cherry picked from commit bba5f81)

.evergreen/run-import-time-test.sh

@@ -25,7 +25,9 @@ function get_import_time() {
 }
 
 get_import_time $HEAD_SHA
+git stash
 git checkout $BASE_SHA
 get_import_time $BASE_SHA
 git checkout $HEAD_SHA
+git stash apply
 python tools/compare_import_time.py $HEAD_SHA $BASE_SHA

.evergreen/run-mod-wsgi-tests.sh

@@ -19,7 +19,10 @@ fi
 PYTHON_VERSION=$(${PYTHON_BINARY} -c "import sys; sys.stdout.write('.'.join(str(val) for val in sys.version_info[:2]))")
 
 # Ensure the C extensions are installed.
-${PYTHON_BINARY} -m pip install -e .
+${PYTHON_BINARY} -m venv --system-site-packages .venv
+source .venv/bin/activate
+pip install -U pip
+python -m pip install -e .
 
 export MOD_WSGI_SO=/opt/python/mod_wsgi/python_version/$PYTHON_VERSION/mod_wsgi_version/$MOD_WSGI_VERSION/mod_wsgi.so
 export PYTHONHOME=/opt/python/$PYTHON_VERSION
@@ -38,10 +41,12 @@ trap '$APACHE -k stop -f ${PROJECT_DIRECTORY}/test/mod_wsgi_test/${APACHE_CONFIG
 wget -t 1 -T 10 -O - "http://localhost:8080/interpreter1${PROJECT_DIRECTORY}" || (cat error_log && exit 1)
 wget -t 1 -T 10 -O - "http://localhost:8080/interpreter2${PROJECT_DIRECTORY}" || (cat error_log && exit 1)
 
-${PYTHON_BINARY} ${PROJECT_DIRECTORY}/test/mod_wsgi_test/test_client.py -n 25000 -t 100 parallel \
+python ${PROJECT_DIRECTORY}/test/mod_wsgi_test/test_client.py -n 25000 -t 100 parallel \
     http://localhost:8080/interpreter1${PROJECT_DIRECTORY} http://localhost:8080/interpreter2${PROJECT_DIRECTORY} || \
     (tail -n 100 error_log && exit 1)
 
-${PYTHON_BINARY} ${PROJECT_DIRECTORY}/test/mod_wsgi_test/test_client.py -n 25000 serial \
+python ${PROJECT_DIRECTORY}/test/mod_wsgi_test/test_client.py -n 25000 serial \
     http://localhost:8080/interpreter1${PROJECT_DIRECTORY} http://localhost:8080/interpreter2${PROJECT_DIRECTORY} || \
     (tail -n 100 error_log && exit 1)
+
+rm -rf .venv