Need to address lack of poetry export plugin in gitlab ci

I had to reset up my dev environment after changing my OS, and I discovered that as of poetry 2.0.0, we need to install an additional poetry plugin in order to use the poetry export command we use in the CI jobs. I think we haven't had to do this before because it's leftover from when we had an older version of poetry, but if we try to install on a fresh machine we'll probably hit issues if we don't add a line.

We can fix this by adding pipx inject poetry poetry-plugin-export to the deploy jobs.