The repo health workflow previously required at least one dev/* branch
to exist, which is too strict after the plain 'dev' branch was deleted.
This change removes that requirement while keeping the validation that
prohibits plain 'dev' branches. The workflow now:
- Allows dev/* branches (e.g., dev/01.00.00)
- Prohibits plain 'dev' branches
- Does not require any dev/* branch to exist
Co-authored-by: jmiller-moko <230051081+jmiller-moko@users.noreply.github.com>