[stable10] test response of files_external ocs endpoint

[individual-it]

backport of #34680

[codecov]

Codecov Report

Merging #34682 into stable10 will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             stable10   #34682   +/-   ##
===========================================
  Coverage          64%      64%           
  Complexity      19247    19247           
===========================================
  Files            1276     1276           
  Lines           75801    75801           
  Branches         1291     1291           
===========================================
  Hits            48515    48515           
  Misses          26907    26907           
  Partials          379      379

Flag	Coverage Δ	Complexity Δ
#javascript	53.22% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	65.15% <ø> (ø)	19247 <ø> (ø)	⬇️

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