SQL Projects vscode tasks new issues found in testing

[ssreerama]

• Azure Data Studio Version: Preview version
• OS Version: Any

Issues:

1. Build failing when sqlproj path has a space in it.
2. VSCode 'Run task' tasks are duplicated when the workspace folders of multiple projects has parent-child hierarchy.
3. Open new workspace should create the task automatically without reloading the instance, working fine for newly created projects.

Steps to Reproduce:

1. Create a SQL Projects in the SQLProj extension with a directory having a space in its name.
2. Build the project, it fails from Menu/RunTask/RunBuildTask.
3. Open/create existing workspace folders and verify 'Run task' sqlproj-build folder when the workspace folders are hierarchy.

Does this issue occur when all extensions are disabled?: Yes/No