Test suite pip installs into current environment

[jatkinson1000]

The test script installs the dependencies for all integration tests via pip:

FTorch/run_test_suite.sh

Lines 83 to 96 in c21040d

	# Run integration tests
	if [ "${RUN_INTEGRATION}" = true ]; then
	if [ -e "${BUILD_DIR}/test/examples/3_MultiGPU" ]; then
	EXAMPLES="1_SimpleNet 2_ResNet18 3_MultiGPU 4_MultiIO 6_Autograd"
	else
	EXAMPLES="1_SimpleNet 2_ResNet18 4_MultiIO 6_Autograd"
	fi
	for EXAMPLE in ${EXAMPLES}; do
	pip -q install -r examples/"${EXAMPLE}"/requirements.txt
	cd "${BUILD_DIR}"/test/examples/"${EXAMPLE}"
	ctest "${CTEST_ARGS}"
	cd -
	done
	fi

but they go into the current environment.

This was fine on GitHub workflows where we reactivate a venv, but we should probably suggest users make sure that they are running it from within a venv to avoid environment pollution.

[jwallwork23]

We could add a check like this?

if [ "${VIRTUAL_ENV}" == "" ]; then
  echo "Please activate your virtual environment before running the test suite."
  exit 1
fi