Stop running Infrastructure tests in CI.

* Infrastructure tests are fragile. And we don't have a
  plan to support it in the future.
  We will probably remove the whole code later.

* see
  * #98
  * #99

.github/workflows/ci.yml

@@ -21,22 +21,13 @@ jobs:
       run: |
         dotnet build tests/DotNetLightning.Core.Tests -p:BouncyCastle=True
         dotnet run --project tests/DotNetLightning.Core.Tests
-    - name: Run Infrastructure tests on BouncyCastle
-      # we want to run only once.
-      if: startsWith(matrix.os, 'ubuntu-18')
-      run: |
-        dotnet build tests/DotNetLightning.Infrastructure.Tests -p:BouncyCastle=True
-        dotnet run --project tests/DotNetLightning.Infrastructure.Tests
 
     - name: Clean to prepare for NSec build
       run: |
         dotnet clean
     - name: Run core tests
       run: |
         dotnet run --project tests/DotNetLightning.Core.Tests
-    - name: Run Infrastructure tests
-      run: |
-        dotnet run --project tests/DotNetLightning.Infrastructure.Tests
     - name: Run other tests
       run: |
         dotnet test