supabase / supabase / 21616304984

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chore: remove tableQuickstart and realtimeButtonVariant experiments (#42388)

## Summary

Removes two concluded A/B experiments that didn't produce positive
results:
- **tableQuickstart**: Tested AI-powered table generation, template
selection, and assistant integration for new table creation
- **realtimeButtonVariant**: Tested hiding the realtime button or
replacing it with a triggers button

## Changes

- Delete `TableQuickstart/` folder with AI widget, templates widget, and
generation hooks
- Delete `useRealtimeExperiment` hook and remove variant-conditional
logic
- Delete `/api/ai/table-quickstart/generate-schemas` endpoint
- Remove telemetry event definitions for both experiments
- Remove local storage exposure tracking key
- Remove API endpoint from proxy whitelist
- Clean up eslint baseline references

## Testing

- [x] Tested locally - Table Editor renders correctly without experiment
widgets
- [x] TypeScript compiles without errors
- [x] No remaining references to removed experiment code

**Quick test:**
1. Navigate to Table Editor → New Tab shows only "Create a table" card
(no AI/Templates/Assistant variants)
2. Open table create panel → Realtime checkbox shows unconditionally
when realtime is enabled

## Linear

fixes GROWTH-609

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

* **Removed Features**
* AI-powered table generation and quickstart assistance (templates, AI
widget, generation hook, templates data, and related utilities)
  * Quickstart templates widget and predefined table templates
  * Database triggers management interface
  * Realtime experiment gating and related experiment variants

* **API & Storage**
  * Hosted AI quickstart API endpoint removed
  * Local storage key for quickstart exposure tracking removed

* **Telemetry**
  * Quickstart- and realtime-experiment telemetry events removed

* **UI Changes**
  * Simplified realtime toggle control in the table editor
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