supabase / supabase / 27001272075

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feat(billing): show cancel subscription button on billing page (#46500)

Extracts the Cancellation Flow from the subscriptions side panel and
adds a new button that initiates the flow (old journey is still
possible):

(screenshots see below)

Verified manually:


- ✅ confirmed the old downgrade flow works, Team -> Pro; Pro -> Free
- ✅ confirmed the new downgrade flow works
- ✅ button does not show up when on free plan; no flicker
- ✅ button does not show up on enterprise/platform plan
- ✅ verified button is disabled when managed by AWS marketplace
(hardcoded in `useSelectedOrganizationQuery`)
- ✅ verified button is disabled if `canUpdateSubscriton` is false,
hardcoded in `useAsyncCheckPermissions`
- ✅ modal for exceeding-free-projects shows up


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

* **New Features**
* Added a guided subscription cancellation flow with confirmation steps,
member/usage checks, and an exit survey.
* Exposed a visible "Cancel Subscription" control in billing settings,
enabled/disabled with contextual tooltip messaging.

* **Improvements**
* Downgrade/exit survey confirm action can be disabled when appropriate;
exit survey confirm label updated to "Downgrade Now".

* **Chores**
  * Added frontend telemetry for cancellation button interactions.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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