Better error message when using spacelift_current_space

Description of the change

When running in a non-administrative stack this data source cannot be accessed, but error message is not so clear.

[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)

[ ] Lint rules pass locally
[ ] The code changed/added as part of this pull request has been covered with tests
[ ] 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.)
[ ] If the action fails that checks the documentation: Run go generate to make sure the docs are up to date

[ ] This pull request has a descriptive title and information useful to a reviewer. There may be a screenshot or screencast attached
[ ] Pull Request is no longer marked as "draft"
[ ] Reviewers have been assigned
[ ] Changes have been reviewed by at least one other engineer
[ ] The target branch is future unless the change is going directly into production