Remove solution and build workflow, update publish workflow

- Deleted CSTNet.sln because it was a pain to manage two
- Also deleted the test workflow due to costs.
- Updated publish workflow to use .NET 10.0.x and improved formatting.

.github/workflows/publish.yml

@@ -1,26 +1,26 @@
 name: Publish Release Package
 on:
-  push:
-    branches:
-      - "releases/**"
+    push:
+        branches:
+            - "releases/**"
 jobs:
-  publish:
-    name: Package Release
-    runs-on: ubuntu-latest
-    env:
-        NUGET_PACKAGES: ${{ github.workspace }}/.nuget/packages
-    steps:
-      - uses: actions/checkout@v2
-      - name: Setup dotnet
-        uses: actions/setup-dotnet@v3
-        with:
-          dotnet-version: "8.0.x"
-      - name: Install dependencies
-        run: dotnet restore
-      - name: Package
-        run: dotnet pack --no-restore -o .
-      - name: Publish to Nuget
+    publish:
+        name: Package Release
+        runs-on: ubuntu-latest
         env:
-          NUGET_KEY: ${{ secrets.DEPLOY_KEY }}
-          NUGET_API: https://api.nuget.org/v3/index.json
-        run: dotnet nuget push CSTNet.*.nupkg --api-key $NUGET_KEY --source $NUGET_API
+            NUGET_PACKAGES: ${{ github.workspace }}/.nuget/packages
+        steps:
+            - uses: actions/checkout@v2
+            - name: Setup dotnet
+              uses: actions/setup-dotnet@v3
+              with:
+                  dotnet-version: "10.0.x"
+            - name: Install dependencies
+              run: dotnet restore
+            - name: Package
+              run: dotnet pack --no-restore -o .
+            - name: Publish to Nuget
+              env:
+                  NUGET_KEY: ${{ secrets.DEPLOY_KEY }}
+                  NUGET_API: https://api.nuget.org/v3/index.json
+              run: dotnet nuget push CSTNet.*.nupkg --api-key $NUGET_KEY --source $NUGET_API