PY-35423: Add helpers dir to sys.path.
PY-35423: Add helpers dir to sys.path.

Env plugin could break PYTHONPATH.
Helpers import each other, so we need to have helpers dir in sys.path

GitOrigin-RevId: d47b763765f6ff26ab77898f03008c4078e28acc
allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community,allotria/intellij-community