fix: remove Faker from DataPlane integration tests

[ndr-brt]

What this PR changes/adds

Remove Faker from data plane integration tests, as it seems to make them flaky (see #1847)

Why it does that

To strengthen tests

Further notes

• the DataPlaneHttpToHttpIntegrationTests seems to be more of a system-test than an integration test, since it run a launcher: data-plane-server
• DataPlaneHttpPullIntegrationTests could stay in the data-plane-http module, since that's what it's testing

Linked Issue(s)

Closes #1847

Checklist

• added appropriate tests?
• performed checkstyle check locally?
• added/updated copyright headers?
• documented public classes/methods?
• added/updated relevant documentation?
• assigned appropriate label? (exclude from changelog with label no-changelog)
• formatted title correctly? (take a look at the CONTRIBUTING and styleguide for details)

[codecov-commenter]

Codecov Report

Merging #1849 (f04b825) into main (8289194) will increase coverage by 6.77%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main    #1849      +/-   ##
============================================
+ Coverage     60.72%   67.50%   +6.77%     
============================================
  Files           779      779              
  Lines         16608    16608              
  Branches       1085     1085              
============================================
+ Hits          10086    11211    +1125     
+ Misses         6101     4929    -1172     
- Partials        421      468      +47     

Impacted Files	Coverage Δ
...iation/ProviderContractNegotiationManagerImpl.java	90.55% <0.00%> (+0.55%)	⬆️
.../api/multipart/handler/ArtifactRequestHandler.java	61.42% <0.00%> (+1.42%)	⬆️
...i/multipart/handler/DescriptionRequestHandler.java	72.54% <0.00%> (+1.96%)	⬆️
...patcher/sender/MultipartArtifactRequestSender.java	83.33% <0.00%> (+5.55%)	⬆️
...nder/MultipartCatalogDescriptionRequestSender.java	5.88% <0.00%> (+5.88%)	⬆️
...r/MultipartEndpointDataReferenceRequestSender.java	92.85% <0.00%> (+7.14%)	⬆️
.../policy/store/schema/SqlPolicyStoreStatements.java	92.30% <0.00%> (+7.69%)	⬆️
...nition/store/schema/postgres/CriterionMapping.java	14.28% <0.00%> (+14.28%)	⬆️
...s/store/schema/TransferProcessStoreStatements.java	100.00% <0.00%> (+17.85%)	⬆️
...on/store/schema/ContractNegotiationStatements.java	100.00% <0.00%> (+37.93%)	⬆️
... and 27 more

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[paullatzelsperger]

I vote for getting rid of the faker everywhere!