Objects: Adds tests to CI job

[AlanRynne]

Adds a step in build-objects to run the Objects unit tests (currently quite lacking).

Adds unit test to ensure all objects in ObjectsKit have an empty constructor implemented.

In order to not duplicate builds, build-objects will now only build:

• Objects.csproj
• Tests.csproj

All other projects correspond to Converters that are already being built on each of their respective Connector builds.

This also allowed to change the VM from windows to linux, which has less minute cost.

[codecov]

Codecov Report

Base: 42.11% // Head: 1.67% // Decreases project coverage by -40.43% ⚠️

Coverage data is based on head (8055189) compared to base (1904e9c).
Patch has no changes to coverable lines.

❗ Current head 8055189 differs from pull request most recent head 95be744. Consider uploading reports for the commit 95be744 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #1621       +/-   ##
==========================================
- Coverage   42.11%   1.67%   -40.44%     
==========================================
  Files          61     226      +165     
  Lines        5499   10065     +4566     
  Branches      821     994      +173     
==========================================
- Hits         2316     169     -2147     
- Misses       2999    9887     +6888     
+ Partials      184       9      -175     

Impacted Files	Coverage Δ
Core/Core/Api/Operations/Operations.cs	0.00% <0.00%> (-100.00%)	⬇️
Core/Core/Api/GraphQL/SubscriptionModels.cs	0.00% <0.00%> (-96.43%)	⬇️
...Api/GraphQL/Serializer/NewtonsoftJsonSerializer.cs	0.00% <0.00%> (-96.16%)	⬇️
...Core/Serialisation/DeserializationWorkerThreads.cs	0.00% <0.00%> (-93.75%)	⬇️
Core/Core/Models/Extensions.cs	0.00% <0.00%> (-83.73%)	⬇️
Core/Core/Serialisation/BaseObjectSerializerV2.cs	0.00% <0.00%> (-82.21%)	⬇️
Core/Core/Transports/Utilities.cs	0.00% <0.00%> (-81.82%)	⬇️
...ore/Core/Serialisation/BaseObjectDeserializerV2.cs	0.00% <0.00%> (-80.46%)	⬇️
Core/Core/Models/DynamicBase.cs	3.40% <0.00%> (-78.41%)	⬇️
...re/Core/Api/GraphQL/Client.Subscriptions.Branch.cs	0.00% <0.00%> (-77.78%)	⬇️
... and 223 more

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[AlanRynne]

Disabled CodeCov upload. Should coordinate later on if we want to add these to the coverage, as we'd need to also add Core tests so that the coverage is "complete".

See current coverage report dropping from 40% to 1% because Core tests were not run (nor uploaded)