refactor: cleanup 0.4.x deprecations

[ndr-brt]

What this PR changes/adds

Delete 0.4.x deprecations

Why it does that

cleanup

Further notes

List other areas of code that have changed but are not necessarily linked to the main feature. This could be method
signature changes, package declarations, bugs that were encountered and were fixed inline, etc.

Linked Issue(s)

Closes # <-- insert Issue number if one exists

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 40.00000% with 54 lines in your changes missing coverage. Please review.

Project coverage is 75.24%. Comparing base (7f20ba5) to head (10a3c09).
Report is 352 commits behind head on main.

Files	Patch %	Lines
...onObjectToContractAgreementMessageTransformer.java	0.00%	12 Missing ⚠️
...tractNegotiationTerminationMessageTransformer.java	0.00%	12 Missing ⚠️
...tToContractNegotiationEventMessageTransformer.java	50.00%	6 Missing ⚠️
...JsonObjectToContractRequestMessageTransformer.java	0.00%	6 Missing ⚠️
...nObjectToTransferCompletionMessageTransformer.java	50.00%	6 Missing ⚠️
...o/JsonObjectToTransferStartMessageTransformer.java	50.00%	6 Missing ⚠️
...ObjectToTransferTerminationMessageTransformer.java	50.00%	6 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4354      +/-   ##
==========================================
+ Coverage   71.74%   75.24%   +3.50%     
==========================================
  Files         919     1053     +134     
  Lines       18457    21089    +2632     
  Branches     1037     1157     +120     
==========================================
+ Hits        13242    15869    +2627     
+ Misses       4756     4701      -55     
- Partials      459      519      +60     

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[paullatzelsperger]

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[wolf4ood]

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