Rysweet ensure helloagent in test uses grpc

[rysweet]

removing the dependency between tests and sample projects because that got broken too easily

Why are these changes needed?

integration tests used to use the samples - now they are separate

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.35%. Comparing base (e27f74e) to head (cd3e8b5).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5497      +/-   ##
==========================================
+ Coverage   78.17%   78.35%   +0.18%     
==========================================
  Files         167      167              
  Lines        9923     9923              
==========================================
+ Hits         7757     7775      +18     
+ Misses       2166     2148      -18     

Flag	Coverage Δ
unittests	78.35% <ø> (+0.18%)	⬆️

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