[APPS-1274][BUG] Prevent parameter names from being "name"

**NOTE:** This is v2 of this PR. I bumped the ruby version, and redid this, so it would be less confusing.

We added a validation to stop people from calling their parameters "name":

zendesk/zendesk_app_market#619
https://zendesk.atlassian.net/browse/APPS-1274

/cc @zendesk/quokka