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utils: return immutable tuples from mounts cache and sets property

`get_mounts`, `reload_mounts`, and the cached `_MOUNTS_CACHE` now hold
and return `tuple[str, ...]` rather than `list[str]`, so callers can
no longer mutate the cached mount list and corrupt later reads.

`DirectorySplitter.sets` now returns `tuple[tuple[str, ...], ...]`
built fresh on each access, so callers can no longer reach through
the property to mutate the splitter's internal `_sets`.

Update test assertions that compared against list literals to use
tuple literals.

Signed-off-by: Andrew Udvare <audvare@gmail.com>

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