[test] fixed gemini plugin test

[FrankLeeeee]

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Fixed #3413

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This PR fixed the memory leakage in the auto parallel module and unskipped the gemini plugin test.

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[github-actions]

The code coverage for the changed files is 46%.

Click me to view the complete report

Name                                                      Stmts   Miss  Cover
-----------------------------------------------------------------------------
colossalai/auto_parallel/offload/base_offload_module.py      71     47    34%
colossalai/auto_parallel/offload/mem_optimize.py             36     24    33%
colossalai/auto_parallel/offload/runtime.py                 146    126    14%
colossalai/auto_parallel/offload/util.py                     58     30    48%
tests/test_auto_parallel/test_offload/test_perf.py          112     85    24%
tests/test_booster/test_plugin/test_gemini_plugin.py         72      5    93%
tests/test_zero/low_level_zero/test_zero1_2.py               93      1    99%
-----------------------------------------------------------------------------
TOTAL                                                       588    318    46%