[Accton] Fix a bug that benchmark can't run continuous sub-tests.

[BrandonCheng0121]

Description:
This fix can make the benchmark run continuous sub-tests instead of only running them individually.

Pre-submission checklist

• I've ran the linters locally and fixed lint errors related to the files I modified in this PR. You can install the linters by running pip install -r requirements-dev.txt && pre-commit install
• pre-commit run
  pre-commit run --files fboss/agent/SwSwitch.cpp
  pre-commit run --files fboss/lib/restart_tracker/RestartTimeTracker.cpp

Summary

Test Plan

The benchmark, sai_stats_collection_speed-sai_impl, has been tested. With the fix, it can test two sub-tests within it in a test run.
The related post in workplace is https://fb.workplace.com/groups/externalmp3nfbossacctonmeta/permalink/1250282870307419/
And the other benchmark, sai_fsw_scale_route_add_speed-sai_impl, that has only one sub-test, is also tested.

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