[Bug]: Schema comparison select/deselct unresponsive and slow.

### Description

After doing the comparison and seeing the objects list. The select/deselect button doesn't seem to work well, when i click it doesn't seem to respond, then maybe 5 minutes later i will come back and it's unselected.

When I try to save the scmp file it also doesn't actually save the file after clicking the save button on the pop-window.

### Steps to Reproduce

1. Open 2 DBs
2. Open Schema compare
3. Select the source and target dbs
4. click compare
5. wait for comparison to complete
6. try to toggle some objects. (fails here)

### Affected Area

- [ ] Connection dialog
- [ ] Query results panel
- [ ] Query editor
- [ ] Object Explorer
- [ ] Table Designer
- [x] Schema Compare
- [ ] Schema Designer
- [ ] Local container
- [ ] GitHub Copilot integration
- [ ] Query Plan Visualizer
- [ ] Other (please describe below)

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

_No response_

### Environment Information

VS code version: 1.103.1
extension version: 1.35.0
windows 11

### Confirmation

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