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`log_vc_info`: add tests for when VCS not installed
Just adding some tests after doing the same in https://github.com/metomi/rose/pull/2818
Check List
- [x] I have read
CONTRIBUTING.mdand added my name as a Code Contributor. - [x] Contains logically grouped changes (else tidy your branch by rebase).
- [x] Does not contain off-topic changes (use other PRs for other changes).
(Current test failure is unrelated - flaky Tui integration tests)