fix: enforce consistency of contract negotiation request and transfer request

[bscholtes1A]

What this PR changes/adds

This PR fixes two issues of the current implementation:

• in contract negotiation request, the asset id part of the offer id can be different from the asset id provided in the target field of the Policy.
• in transfer request, the asset id provided in the request can be different to the one referred by the contract id also provided in this same request. This leads to inconsistent EndpointDataReferenceEntry being generated.

Why it does that

Fix.

Linked Issue(s)

Closes #4239
Closes #4240

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 84.61538% with 2 lines in your changes missing coverage. Please review.

Project coverage is 75.03%. Comparing base (7f20ba5) to head (0eff36e).
Report is 299 commits behind head on main.

Files	Patch %	Lines
...ract/validation/ContractValidationServiceImpl.java	66.66%	1 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4264      +/-   ##
==========================================
+ Coverage   71.74%   75.03%   +3.28%     
==========================================
  Files         919     1046     +127     
  Lines       18457    20987    +2530     
  Branches     1037     1171     +134     
==========================================
+ Hits        13242    15747    +2505     
+ Misses       4756     4727      -29     
- Partials      459      513      +54     

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[ndr-brt]

LGTM