fix(test): skip creating secret file dir in simulation test

[yuhao-su]

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What's changed and what's your intention?

Creating secret directories will cause file creation conflict in concurrent simulation tests.

This will not happen in any deployment because we use cluster id (uuid) to distinguish files from different cluster. But we are running deterministic-it-test.sh concurrently, and nextest is running multiple ut concurrently. So even with different madsim seed for each deterministic-it-test.sh, two ut in the same run share the same seed, causing the same uuid in different cluster (bc madsim hook the random function in uuid::new_v4)

We currently do not have e2e for secret file. Should skip testing secret files in simulation tests if we have in the future.

close #17740

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[wangrunji0408]

Thanks