Add a test that checks export version of project templates and test export archive
## Description
When we bump import/export version in `ImportExport` class some number of tests is going to fail in the CI, without a meaningful description. It then takes a considerable amount of time, for someone not involved in developing import/export feature in the past, only to learn that we have `test_project_export.tar.gz` and project templates that need a version bump in `VERSION` as well.
I think we should add a test that will check export version in `test_project_export.tar.gz` against `ImportExport::VERSION` and print a meaningful message in the CI in case of a failure. /cc @jameslopez
issue