refact file acquisition tests: prevent data race

[mmetc]

No description provided.

[github-actions]

@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]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.63%. Comparing base (4624f98) to head (b87d7aa).

❗ There is a different number of reports uploaded between BASE (4624f98) and HEAD (b87d7aa). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (4624f98)	HEAD (b87d7aa)
unit-windows	1	0
unit-linux	1	0

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #3957       +/-   ##
===========================================
- Coverage   63.10%   46.63%   -16.48%     
===========================================
  Files         473      450       -23     
  Lines       33476    32335     -1141     
===========================================
- Hits        21126    15080     -6046     
- Misses      10226    15427     +5201     
+ Partials     2124     1828      -296     

Flag	Coverage Δ
bats	46.63% <ø> (+0.03%)	⬆️
unit-linux	?
unit-windows	?

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