Fix CS1591: Add XML documentation to GetDummyQuery method (#15)

* Initial plan

* Add XML documentation comment to GetDummyQuery method to fix CS1591

Co-authored-by: droyad <1687639+droyad@users.noreply.github.com>

* Updated approval file

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: droyad <1687639+droyad@users.noreply.github.com>
Co-authored-by: Robert Wagner <robert@wagner.id.au>

Author: Copilot

src/Tests/ApprovalFiles/NoPublicApiChanges.Run.approved.cs

@@ -25,6 +25,7 @@ public class OracleConnectionManager : DbUp.Engine.Transactions.DatabaseConnecti
             "ate command splitter instance.")]
         public OracleConnectionManager(string connectionString) { }
         public OracleConnectionManager(string connectionString, DbUp.Oracle.OracleCommandSplitter commandSplitter) { }
+        protected override string GetDummyQuery() { }
         public override System.Collections.Generic.IEnumerable<string> SplitScriptIntoCommands(string scriptContents) { }
     }
     public class OracleCustomDelimiterCommandReader : DbUp.Support.SqlCommandReader

src/dbup-oracle/OracleConnectionManager.cs

@@ -12,6 +12,9 @@ public class OracleConnectionManager : DatabaseConnectionManager
     {
         private readonly OracleCommandSplitter commandSplitter;
 
+        /// <summary>
+        /// Gets a dummy query used to test the connection.
+        /// </summary>
         protected override string GetDummyQuery() => "select 1 from dual";
 
         /// <summary>