[Bug]: Object Explorer does not label Columnstore Indexes correctly

@aasimkhan30 is already working on this.

Since Aug 12, 2026.

### Description

**Describe the bug**
When creating a Clustered Columnstore Index (or Non-Clustered Columnstore Index), the Object Explorer in VS Code labels it as `(Non-Unique, Clustered)` instead of explicitly identifying it as a Columnstore index.

### Steps to Reproduce

**To Reproduce**
Steps to reproduce the behavior:
1. Run the following T-SQL to create a Columnstore Index:
`CREATE CLUSTERED COLUMNSTORE INDEX idx_test_CS ON dbo.TestTable;`
2. Refresh the Object Explorer and navigate to the Indexes folder for the table.
3. Observe the label for the index.
**Expected behavior**
The Object Explorer should indicate that the index is a Columnstore index (e.g., `(Clustered Columnstore)`), similar to how SSMS handles it.
**Screenshots**

### Affected Area

- [ ] Connection dialog (SQL Server | Azure browse/Fabric browse)
- [ ] Query editor
- [ ] Query results panel
- [x] 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

- VS Code Version: 1.130.0
- MSSQL Extension Version: 1.44.1
- Operating System: macOS 26.5.2
- Connection Type : SQL Server

### Confirmation

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