Fix a number of cred scan hits (#800)

Bunch of secrets in files, usually fixed by generating random password. The deleted script files didn't seem to be used anywhere.

test/Microsoft.SqlTools.ServiceLayer.Test.Common/Extensions/ExceptionExtensions.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Text;
+
+namespace Microsoft.SqlTools.ServiceLayer.Test.Common.Extensions
+{
+    public static class ExceptionExtensions
+    {
+        /// <summary>
+        /// Builds a string containing the exception messages and all messages of child InnerExceptions.
+        /// </summary>
+        /// <param name="e"></param>
+        /// <returns></returns>
+        public static string BuildRecursiveErrorMessage(this Exception e)
+        {
+            var msg = new StringBuilder();
+            while (e != null)
+            {
+                msg.AppendLine(e.Message);
+                e = e.InnerException;
+            }
+
+            return msg.ToString();
+        }
+    }
+}