Update subscription message and enhance upgrade plan details for Gitpod's transition to Ona#21053

roboquat merged 3 commits intomaingitpod-io/gitpod:mainfrom

siddhant/gro-1107-prevent-new-subscriptions-and-update-classic-payg-billinggitpod-io/gitpod:siddhant/gro-1107-prevent-new-subscriptions-and-update-classic-payg-billingCopy head branch name to clipboard