supabase / supabase / 21819647114

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chore(studio): Consolidate incident banner + maintenance banner, make incident banner dismissible (#42551)

## Context

PR mainly adds a change to allow users to dismiss an incident banner

Am also taking this time to consolidate `IncidentBanner` and
`MaintenanceBanner` into a single component `StatusPageBanner` so that
the logic for rendering either component is more clearer.

## Intended behaviour (should be covered by e2e tests)
- Incident banner shows if there are incidents with impact !== 'none'
- Incident banner still takes precedence over Maintanence banner (if
there's both incident + maintenence events)
- Dismissing the incident banner will subsequently show the maintenance
banner if the maintenance hasn't been dismissed before (just to make
sure that the user doesn't miss any comms)
- Incident banner will not be dismissible if there's an override (via
feature flag or env var)

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

* **New Features**
* Unified status page banner showing incident or maintenance
notifications, with dismissible banners that persist across sessions;
incident notices take precedence over maintenance.

* **Refactor**
* Replaced separate incident and maintenance banners with a single
consolidated StatusPageBanner component.

* **Tests**
* Added end-to-end tests covering banner visibility, precedence, and
dismissal behavior.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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