Enable yolov5ts unittest for ONNX exporting

[zhiqwang]

No description provided.

[codecov]

Codecov Report

Merging #280 (f1626c2) into main (3485ea1) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #280   +/-   ##
=======================================
  Coverage   94.01%   94.01%           
=======================================
  Files          11       11           
  Lines         718      718           
=======================================
  Hits          675      675           
  Misses         43       43           

Flag	Coverage Δ
unittests	94.01% <ø> (ø)

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Impacted Files	Coverage Δ
test/test_onnx.py	85.71% <ø> (ø)

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