rdb_test unit test LoadStream2 failed

[kostasrim]

https://github.com/dragonflydb/dragonfly/actions/runs/12065815330/job/33645375727#step:10:22705

2024-11-28T09:36:48.1561541Z 63: E20241128 09:36:48.155498 26092 server_family.cc:1151] Rdb load failed: Out of memory, or used memory is too high
2024-11-28T09:36:48.1672290Z 63: [       OK ] RdbTest.SnapshotTooBig (65 ms)
2024-11-28T09:36:48.1672873Z 63: [ RUN      ] RdbTest.LoadStream2
2024-11-28T09:36:48.1945081Z 63: E20241128 09:36:48.194010 26100 rdb_load.cc:2798] OOM failed to add key 'mystream' in DB 0
2024-11-28T09:36:48.2026251Z 63: unknown file: Failure
2024-11-28T09:36:48.2027292Z 63: C++ exception with description "Unexpected index" thrown in the test body.
2024-11-28T09:36:48.2028230Z 63: 
2024-11-28T09:36:48.2136158Z 63: [  FAILED  ] RdbTest.LoadStream2 (46 ms)