Correct stow listing function

[bgedik]

Why are the changes needed?

The listing function added for stow container as part of RFC #5598 has a bug, which we hit when doing E2E testing. The Items() stow container function behavior implemented in the listing test mock container differed from the actual behavior. Thus the test was asserting against incorrect behavior.

What changes were proposed in this pull request?

Correct listing function to return full URIs.

How was this patch tested?

Corrected unit test (in repo)
Also tested against minio

Related PRs

#5795

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.96%. Comparing base (f27aff4) to head (aa00023).
Report is 6 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6013   +/-   ##
=======================================
  Coverage   36.95%   36.96%           
=======================================
  Files        1310     1312    +2     
  Lines      131464   131516   +52     
=======================================
+ Hits        48587    48614   +27     
- Misses      78656    78674   +18     
- Partials     4221     4228    +7     

Flag	Coverage Δ
unittests-datacatalog	51.58% <ø> (ø)
unittests-flyteadmin	54.05% <ø> (-0.03%)	⬇️
unittests-flytecopilot	22.23% <ø> (ø)
unittests-flytectl	62.39% <ø> (ø)
unittests-flyteidl	7.05% <ø> (+0.09%)	⬆️
unittests-flyteplugins	53.80% <ø> (-0.03%)	⬇️
unittests-flytepropeller	43.10% <ø> (ø)
unittests-flytestdlib	55.26% <100.00%> (-0.04%)	⬇️

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