supabase / supabase / 27817450782

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Local only: skip loading destinations if ETL API is not set up (#47031)

## Context

> [!IMPORTANT]  
> Changes in this PR only apply to the local environment - there should
not be any changes to staging (nor production)

Given that read replicas currently sit under database replication, the
UI currently waits for replication destinations to load before rendering
the page. However for local development, setting up of the ETL API isn't
necessary nor applicable for everyone so this indirectly adds friction
if we just want to work with read replicas.

## Changes involved
- Opting to skip retrying fetching ETL related requests if the error
returned is "replication API URL is not configured"
  - This is indicative that the local platform isn't set up for ETL yet
- ^ Database replication page will hence not wait for ETL requests to
succeed before finally rendering the UI
  - Node diagram will also then render properly (just read replicas)
- Add a small admonition to visualize this
<img width="1079" height="301" alt="image"
src="https://github.com/user-attachments/assets/32bd5d2f-a76e-417e-bedf-9a04de3bb305"
/>

## To test
- Will only be able to test locally - basically just head over to the
database replication page (unless you somehow already have ETL API set
up locally)
- But can also verify that there's no changes on staging preview


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

## Summary by CodeRabbit

* **Bug Fixes**
* Improved error messaging when ETL is not configured in local
development environments
* Enhanced error handling for replication API failures with better
non-retryable error detection

* **Improvements**
* Refined replication diagram rendering based on destination setup state
  * Updated dropdown menu interactions for read replica management

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

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