refact file acquisition tests: prevent data race

[mmetc]

[github-actions[bot]]

@mmetc: There are no area labels on this PR. You can add as many areas as you see fit.

• /area agent
• /area local-api
• /area cscli
• /area appsec
• /area security
• /area configuration

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[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 62.95%. Comparing base (388bace) to head (83c628b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3957      +/-   ##
==========================================
- Coverage   63.54%   62.95%   -0.60%     
==========================================
  Files         450      467      +17     
  Lines       32567    33298     +731     
==========================================
+ Hits        20695    20962     +267     
- Misses       9797    10212     +415     
- Partials     2075     2124      +49     

Flag	Coverage Δ
bats	46.02% <ø> (-0.12%)	:arrow_down:
unit-linux	35.79% <ø> (+0.03%)	:arrow_up:
unit-windows	25.05% <ø> (?)

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