## Context
Related to unifying read replicas into database replication page which
is currently in internal testing
## Changes involved
- Updates the "New replica" CTA in `DatabaseSelector` (e.g within the
SQL Editor) to link to the replication page instead of settings
infrastructure
- Refactor replication UI to use URL query states for new destination +
edit destination
## To test
- [ ] Verify that the "New replica" CTA links correctly to replication
page if flag is on
- [ ] Verify that new + edit destination UI works as expected
- Note that there's some server side validation for ETL replication now
so might be tricky to test creating an actual ETL replication
- Minimally can test creating a read replica and ensure that the UI
behaviour is all as expected
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
* **New Features**
* Added unified replication experience with URL-based state management
for destination creation and editing
* **Refactor**
* Simplified replication panel component interfaces and consolidated
destination data fetching logic
* Enhanced edit flows to leverage URL parameters for seamless navigation
* **Chores**
* Marked legacy read replica creation panel as deprecated
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Coenen Benjamin