selftests/damon/sysfs.py: merge DAMON status dumping into commitment assertion

For each test case, sysfs.py makes changes to DAMON, dumps DAMON internal
status and asserts the expectation is met.  The dumping part should be the
same for all cases, so it is duplicated for each test case.  Which means
it is easy to make mistakes.  Actually a few of those duplicates are not
turning DAMON off in case of the dumping failure.  It makes following
selftests that need to turn DAMON on fails with -EBUSY.  Merge the status
dumping into commitment assertion with proper dumping failure handling, to
deduplicate and avoid the unnecessary following tests failures.

Link: https://lkml.kernel.org/r/20251112154114.66053-8-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Bill Wendling <morbo@google.com>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Gow <davidgow@google.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Justin Stitt <justinstitt@google.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Miguel Ojeda <ojeda@kernel.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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