* fix(test): running test as root
The dummy root path /root conflicts with root user's home directory on Linux and redacts incorrectly. Our downstream CI environment builds tinymist in docker as root and encounters the problem. Change the path to `/dummy-root` fixes it. To ensure consistency, other similar occurences are also prefixed with `dummy-`.
* dev: deduplicate a bit
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Co-authored-by: Myriad-Dreamin <camiyoru@gmail.com>