fix: Fix for storing all objects in case of 'folder' transfer

[dorkau80]

What this PR changes/adds

Fix issue of transferring only last object in case of folder transfer
Fix issue with missing complete file per transferred object
Fix error in resolving secret for empty key
Adds integration test for multiobjects transfer

Why it does that

Currently multiple object transfer does not work as expected - it stores all objects with the same name - which means that all apart from last one gets overwritten.

Further notes

Additionally this PR adjust existing Integration test to test single object transfer as well as multi objects transfer.

Linked Issue(s)

I have noticed that similar issue was created today by @Pluci - so I did not double the issue
Closes #154

[github-actions]

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[ndr-brt]

as an another PR about the same issue already existed, please add review on that one.
this can be closed as duplicated #155

[codecov-commenter]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (f7a4cba) 64.71% compared to head (be04bfa) 65.06%.
Report is 5 commits behind head on main.

Files	Patch %	Lines
...pse/edc/connector/dataplane/aws/s3/S3DataSink.java	85.71%	2 Missing and 1 partial ⚠️
...onnector/dataplane/aws/s3/S3DataSourceFactory.java	0.00%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #156      +/-   ##
==========================================
+ Coverage   64.71%   65.06%   +0.35%     
==========================================
  Files          26       26              
  Lines         632      647      +15     
  Branches       28       30       +2     
==========================================
+ Hits          409      421      +12     
- Misses        218      219       +1     
- Partials        5        7       +2     

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[dorkau80]

@paullatzelsperger / @ndr-brt - could you approve the awaiting workflows?
I hope it should be the last round - it is only about updating the DEPENDENCIES file.

[paullatzelsperger]

@dorkau80 DEPENDENCIES is outdated again. It's a pain, but one we cannot avoid unfortunately.

Regarding the duplicate PR #155: on first glance it looks as though your PR is more comprehensive, but I haven't looked in detail. Seems like there is some cross-pr-communication going on anyway. Were you able to coordinate with @Pluci about possibly merging those two PRs?

[ndr-brt]

for me merging this or the other does not make much difference, but please have some alignment so you decide which PR will make it

[dorkau80]

@Pluci - Is it ok for you if we go with my PR? I think I have addressed all the comments from your and my code review.

[ndr-brt]

Once the conflicts with the main branch are solved we can merge this, the PR provided by @Pluci is stale so I'd prefer this one

[dorkau80]

@ndr-brt - conflicts solved.