[Bug]: Update label for SQL database in Fabric (preview) - Now Generally Available

### Description

The target platform picker is currently listing the SQL database in Fabric as preview; it's been generally available since Nov 2025:

https://community.fabric.microsoft.com/blog/fbc_fabricupdatesblogs/announcing-sql-database-in-fabric-generally-available/5161120

### Steps to Reproduce

Create a new project and the Select target platform list will show the (preview) label.

### Affected Area

- [x] Connection dialog (SQL Server | Azure browse/Fabric browse)
- [ ] Query editor
- [ ] Query results panel
- [ ] Object Explorer
- [ ] GitHub Copilot integration
- [ ] Preview/Edit data
- [ ] Table Designer
- [ ] Schema Designer
- [ ] Schema Compare
- [ ] Local SQL Server Container provisioning
- [ ] SQL database in Fabric provisioning
- [ ] DACPAC/BACPAC export/import
- [ ] SQL Database projects
- [ ] Query Plan Visualizer
- [ ] Other (please describe below)

### If you selected "Other", please describe the affected area

_No response_

### Environment Information

Version: 1.7.0

### Confirmation

- [x] I have searched existing issues and couldn't find a match
- [ ] I want to work on this issue

Reproduce the issue from the target platform picker in the Connection dialog, using the SQL Server, Azure browse, and Fabric browse paths described. Locate the SQL database in Fabric entry and update its label so it no longer says preview, then verify that a new project shows the corrected label.

Written by the indexing model from the issue text.