test: fix external sources executor test's workspace to the same one

[winstonww]

Goal

• [x] Run Integration tests GHA manually & comment the link.

@jina-ai/team-wolf

[codecov[bot]]

Codecov Report

Merging #82 (0729315) into main (fa4d44b) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #82   +/-   ##
=======================================
  Coverage   56.92%   56.92%           
=======================================
  Files          15       15           
  Lines         931      931           
=======================================
  Hits          530      530           
  Misses        401      401           

Flag	Coverage Δ
jcloud	56.92% <ø> (ø)

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