tests/migration: Set compression level in migration tests

Adds calls to set compression level for `zstd` and `zlib` migration
tests, just to make sure that the calls work.

Signed-off-by: Bryan Zhang <bryan.zhang@bytedance.com>
Link: https://lore.kernel.org/r/20240301035901.4006936-3-bryan.zhang@bytedance.com
Signed-off-by: Peter Xu <peterx@redhat.com>
1 file changed