Use proper form ID for the post-sign-up teams beta step
Created by: philipp-spiess
It seems that I made a mistake on the last iteration of https://github.com/sourcegraph/sourcegraph/pull/30413 and we were showing the wrong HubSpot form for the post-sign-up step.
This means that any new leads up until now where added to the old table rather than the new.
Test plan
You can see the hidden value of the new field using the inspect DOM feature. This now properly shows post-signup
.