selftests/damon/drgn_dump_damon_status: dump ctx->ops.id

selftests/damon/drgn_dump_damon_status: dump ctx->ops.id

drgn_dump_damon_status.py is a script for dumping DAMON internal status in
json format.  It is being used for seeing if DAMON parameters that are set
using _damon_sysfs.py are actually passed to DAMON in the kernel space.
It is, however, not dumping full DAMON internal status, and it makes
increasing test coverage difficult.  Add ctx->ops.id dumping for more
tests.

Link: https://lkml.kernel.org/r/20250720171652.92309-11-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>