This PR makes it so users will be sent immediately into the trial
checkout flow (by hitting zed.dev/account/start-trial) when they click
the "Start Pro Trial" button.
Release Notes:
- N/A
This includes making sure that both the agent panel and Zed's edit
prediction have a consistent narrative when it comes to onboarding users
into the AI features, considering the possible different plans and
conditions (such as being signed in/out, account age, etc.)
Release Notes:
- N/A
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Co-authored-by: Bennet Bo Fenner <53836821+bennetbo@users.noreply.github.com>
Co-authored-by: Bennet Bo Fenner <bennetbo@gmx.de>
