Remove primary org reporting task
Remove primary org reporting task

This task was added around 2017, but the only changes since then have
been to fix linting issues. Since fixing the latest linting issue
would require the CSVReport class to exist elsewhere, this seems like
a good opportunity to remove it, rather than let the code creep.

alphagov/whitehall,alphagov/whitehall,alphagov/whitehall,alphagov/whitehall