Update CI workflow to check for breaking API changes in individual projects

Author: glucaci

.github/workflows/ci.yml

@@ -32,7 +32,9 @@ jobs:
 
       - name: Check for breaking API changes
         shell: bash
-        run: dotnet build ./all.csproj --no-restore -warnaserror:RS0016,RS0017
+        run: |
+          dotnet build src/TerraformDotnet.Hcl/TerraformDotnet.Hcl.csproj --no-restore -warnaserror:RS0016,RS0017
+          dotnet build src/TerraformDotnet/TerraformDotnet.csproj --no-restore -warnaserror:RS0016,RS0017
 
       - name: Run tests
         shell: bash