mm/damon/tests/core-kunit: test the size charged for a filter-trimmed region

damos_test_filter_out() checks that an address range filter splits a
region at the filter boundary, and stops there.  Nothing checks what
damos_apply_scheme() then charges to the quota and reports as tried.

damos_test_apply_scheme_filtered_sz() covers the two ways such a filter
trims a region: one that starts before the filter's range, and one that
starts inside it.

damos_test_apply_scheme_filter_sz_unchanged() and
damos_test_apply_scheme_quota_sz() cover the cases whose accounting must
not change: a region wholly inside a reject range, one wholly inside an
allow range, two filters trimming in a single call, a filter type that
never splits, no filter at all, a region the quota trims, and a quota
remainder too small for one region.

Link: https://lore.kernel.org/20260921152443.80132-3-sj@kernel.org
Signed-off-by: Donggeun Yoo <donggeunyoo.kernel@gmail.com>
Signed-off-by: SJ Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: SJ Park <sj@kernel.org>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Gow <david@davidgow.net>
Cc: <stable@vger.kernel.org>

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