Remove dotnet-ef tool config and IIS publish profiles

Deleted dotnet-tools.json (dotnet-ef config) and IIS publish profiles for .NET 7 and .NET 9 (IISProfileNet7Win64.pubxml, IISProfileNet9Win64.pubxml) to clean up unused deployment and tooling files.

EnvelopeGenerator.API/Jenkinsfile

@@ -0,0 +1,10 @@
+pipeline {
+    agent any
+    stages {
+        stage('Build') {
+            steps {
+                sh 'dotnet build'
+            }
+        }
+    }
+}