When specifying a repository for `gh repo set-default`, users can now
use a git remote name (e.g., "origin", "upstream") instead of the
full OWNER/REPO format.
The command first checks if the argument is a git remote name. If
found, it uses the corresponding repository. Otherwise, it falls
back to parsing the argument as OWNER/REPO format.
Example:
gh repo set-default origin
Fixes#9149
Signed-off-by: majiayu000 <1835304752@qq.com>
73c7fd59ef