feat: Add warning log to Hashicorp Vault resolveSecret function

[awellnitz-materna]

What this PR changes/adds

Add warning log to Hashicorp Vault resolveSecret function.

Why it does that

If the secret cannot be resolved, it is currently difficult to find out why.
The log should help the developer to find the bug faster.

Linked Issue(s)

Closes #3462

[github-actions]

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[paullatzelsperger]

took myself off as a reviewer, because the changeset isn't so huge :)

[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (12f1275) 72.24% compared to head (4115171) 63.90%.

❗ Current head 4115171 differs from pull request most recent head f6d369f. Consider uploading reports for the commit f6d369f to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3535      +/-   ##
==========================================
- Coverage   72.24%   63.90%   -8.34%     
==========================================
  Files         863      863              
  Lines       17306    17309       +3     
  Branches      986      986              
==========================================
- Hits        12502    11061    -1441     
- Misses       4392     5873    +1481     
+ Partials      412      375      -37     

Files	Coverage Δ
...rg/eclipse/edc/vault/hashicorp/HashicorpVault.java	100.00% <100.00%> (ø)

... and 53 files with indirect coverage changes

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[jimmarino]

Looks good!

[jimmarino]

@awellnitz-materna please fix the failing check and I will merge the PR

[awellnitz-materna]

@jimmarino I have not customized any dependency. Can you tell me how to regenerate the dependency file?

[wolf4ood]

Hi @awellnitz-materna

for the dependencies you can check the failing run of the license check. It suggests which the updated content of the DEPENDENCIES file should be.

Check

https://github.com/eclipse-edc/Connector/actions/runs/6506078793/job/17671039514?pr=3535#step:6:81