supabase / supabase / 25802414660

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Prevent request billing owner for downgrade of plan (#45823)

Related PR: https://github.com/supabase/supabase/pull/45803

Opting for a simpler way to prevent requesting billing owners for
downgrading of plan as such:
<img width="933" height="258" alt="image"
src="https://github.com/user-attachments/assets/604b8c2f-9341-4aec-885c-e2d9d2861b9f"
/>

Currently we're incorrectly showing a "Request to upgrade to Free" CTA

## To test

- [ ] For a pro plan or above organization, and a user that has a
"Developer" role, ensure that you're not able to downgrade the org nor
send a upgrade request


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Bug Fixes**
* Clarified CTA behavior for users without billing update permission:
downgrade actions now show a disabled button with an explicit tooltip,
while non-downgrade upgrade attempts prompt a request to billing owners.
Tooltip messaging has been refined across enterprise, free-tier, and
marketplace-managed plans for clearer guidance.

[![Review Change
Stack](https://storage.googleapis.com/coderabbit_public_assets/review-stack-in-coderabbit-ui.svg)](https://app.coderabbit.ai/change-stack/supabase/supabase/pull/45823)
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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