test: fix #4191 regressions in autotuner_core and symlink race test

[kahyunnam]

Summary

Fixes two test regressions introduced by #4191 (release-only, not on main):

• [bug][v0.6.16] test_autotuner_core.py AttributeError: 'function' object has no attribute 'cache_clear' #4208 — test_make_tuning_config_reuses_topk_ids_initializer called get_trtllm_moe_sm100_module.cache_clear(), but Split trtllm-gen cubin pins per arch #4191 moved @functools.cache to _get_trtllm_moe_sm100_module_impl.
• [bug][v0.6.16] test_gen_module_symlink_race_condition assert is_symlink #4166 (re-open) — test(jit): assert BMM export symlink under GEN_SRC_DIR #4187 updated the symlink test to assert under GEN_SRC_DIR/flashinfer/..., but Split trtllm-gen cubin pins per arch #4191 moved the export symlink to GEN_SRC_DIR/trtllm_export/fused_moe_trtllm_sm100/flashinfer/....

Both failures appeared on all Blackwell jobs in Test Cycle 2 (pipeline 59912149, rc3).

Test plan

• pytest tests/autotuner/test_autotuner_core.py::test_make_tuning_config_reuses_topk_ids_initializer — pass
• pytest tests/utils/test_gen_module_symlink_race_condition.py — pass
• B300/GB200 CI rerun to confirm cycle-2 green on these two files

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