CLDSRV-992: Fix missing s3 logs artifact for cloudserver

[anurag4DSB]

Backport of CLDSRV-942, from #6216 (30a06a609), cherry-picked unchanged: a one-line switch of the s3c-ft-tests job to the -testcoverage image. That fix landed on development/9.2 and reached 9.3, 9.4, 9.5 and hotfix/9.3.13, but never this branch.

Why it matters here: the plain image runs yarn start with output left on the container stdout, so cloudserver's log is never written to /artifacts and never uploaded. The -testcoverage image runs docker-test-with-coverage.sh, which does nyc yarn start > /artifacts/s3.log 2> /artifacts/s3-stderr.log, which is how every other functional job already captures it. Verified on real runs: a development/9.3 s3c bundle contains a 38 MB s3.log, while the sibling hotfix/9.2.36 bundle, on the same plain image this branch uses, has none. Any cloudserver-originated failure on this job is undiagnosable after the fact until this lands.

One behavioural note for the reviewer: this puts the hotfix s3c job on the nyc-instrumented image, the same one 9.3 and later already run for this job. Nothing else changes.

[bert-e]

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[bert-e]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.37%. Comparing base (ebd2abb) to head (e0eb758).
⚠️ Report is 1 commits behind head on hotfix/9.0.32.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@              Coverage Diff               @@
##           hotfix/9.0.32    #6289   +/-   ##
==============================================
  Coverage          83.37%   83.37%           
==============================================
  Files                189      189           
  Lines              12200    12200           
==============================================
  Hits               10172    10172           
  Misses              2028     2028           

Flag	Coverage Δ
file-ft-tests	66.81% <ø> (-0.06%)	⬇️
kmip-ft-tests	26.99% <ø> (ø)
mongo-v0-ft-tests	68.20% <ø> (ø)
mongo-v1-ft-tests	68.13% <ø> (-0.09%)	⬇️
multiple-backend	35.68% <ø> (ø)
quota-tests	33.08% <ø> (ø)
quota-tests-inflights	34.18% <ø> (-0.04%)	⬇️
unit	67.55% <ø> (ø)
utapi-v2-tests	33.34% <ø> (ø)

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