Use .slnx explicitly in all workflow commands

- Specify SWEN3.Paperless.RabbitMq.slnx in all dotnet commands
- Ensures .NET SDK 9.0.200+ recognizes the solution file
- Eliminates MSB1011 ambiguity error

Author: ANcpLua

.github/workflows/nuget-publish.yml

@@ -37,17 +37,13 @@ jobs:
           args: convert icon.png -trim -resize 512x512 -gravity center -background transparent -extent 512x512 icon.png
 
       - name: Restore dependencies
-        run: |
-          dotnet restore SWEN3.Paperless.RabbitMq/SWEN3.Paperless.RabbitMq.csproj
-          dotnet restore SWEN3.Paperless.RabbitMq.Tests/SWEN3.Paperless.RabbitMq.Tests.csproj
+        run: dotnet restore SWEN3.Paperless.RabbitMq.slnx
 
       - name: Build solution
-        run: |
-          dotnet build SWEN3.Paperless.RabbitMq/SWEN3.Paperless.RabbitMq.csproj --configuration Release --no-restore
-          dotnet build SWEN3.Paperless.RabbitMq.Tests/SWEN3.Paperless.RabbitMq.Tests.csproj --configuration Release --no-restore
+        run: dotnet build SWEN3.Paperless.RabbitMq.slnx --configuration Release --no-restore
 
       - name: Run tests
-        run: dotnet test SWEN3.Paperless.RabbitMq.Tests/SWEN3.Paperless.RabbitMq.Tests.csproj --configuration Release --no-build
+        run: dotnet test SWEN3.Paperless.RabbitMq.slnx --configuration Release --no-build
 
       - name: Pack NuGet package
         run: dotnet pack SWEN3.Paperless.RabbitMq/SWEN3.Paperless.RabbitMq.csproj --configuration Release --no-build --output ./nupkg -p:GeneratePackageOnBuild=false