MultiVCS: Added is_default into stack/module data source and prevent panic on detached VCS integration

Description of the change

We've added is_default into stack/module resource. We need to do the same with data sources as well.
Prevent panic on detached VCS integration

[x] Bug fix (non-breaking change that fixes an issue)
[ ] New feature (non-breaking change that adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
[ ] Documentation (non-breaking change that adds documentation)

Fix [#1]()

[x] Lint rules pass locally
[ ] The code changed/added as part of this pull request has been covered with tests
[x] All tests related to the changed code pass in development
[ ] Examples for new resources and data sources have been added
[ ] Default values have been documented in the description (e.g., "Dummy: (Boolean) Blah blah. Defaults to false.)
[x] If the action fails that checks the documentation: Run go generate to make sure the docs are up to date

[x] This pull request has a descriptive title and information useful to a reviewer. There may be a screenshot or screencast attached
[x] Pull Request is no longer marked as "draft"
[x] Reviewers have been assigned
[x] Changes have been reviewed by at least one other engineer