supabase / supabase / 22171225671

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Hide actions in schema visualizer if schema has no tables (#42849)

## Context

In database/tables (Schema visualizer), if the schema has no tables,
clicking on "Auto layout" causes a client error as we're trying to run
the `dagre.layout` on a graph with 0 nodes and edges

Opting to hide all actions on the Schema Visualizer if there's no tables
(understandably we've been leaning towards disabled states rather than
hiding, but in this case i was thinking hiding is better since that's an
empty state - unless some actions were applicable in the empty state,
but in this case none of the actions are)

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

## Summary by CodeRabbit

## Release Notes

* **Bug Fixes**
* Improved reliability of the database schema interface by strengthening
empty state handling
* Ensured database actions are properly hidden when no tables exist in
the schema

* **Refactor**
* Consolidated schema state validation logic for better code
maintainability

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

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