Fix NpgsqlOptionsExtension losing ParameterizedCollectionMode between clones

Add _parameterizedCollectionMode to the copy constructor so the value
is preserved when Clone() is called by any WithXyz method.

Add test verifying the mode survives a subsequent UsePostgresVersion call.

Agent-Logs-Url: https://github.com/npgsql/efcore.pg/sessions/6210ab26-9cbe-4297-b483-d782610e68e9

Co-authored-by: roji <1862641+roji@users.noreply.github.com>

Author: Copilot

src/EFCore.PG/Infrastructure/Internal/NpgsqlOptionsExtension.cs

@@ -126,6 +126,7 @@ public NpgsqlOptionsExtension(NpgsqlOptionsExtension copyFrom)
         DataSourceBuilderAction = copyFrom.DataSourceBuilderAction;
         AdminDatabase = copyFrom.AdminDatabase;
         _postgresVersion = copyFrom._postgresVersion;
+        _parameterizedCollectionMode = copyFrom._parameterizedCollectionMode;
         UseRedshift = copyFrom.UseRedshift;
         _userRangeDefinitions = [..copyFrom._userRangeDefinitions];
         _enumDefinitions = [..copyFrom._enumDefinitions];

test/EFCore.PG.Tests/NpgsqlDbContextOptionsExtensionsTest.cs

@@ -26,6 +26,21 @@ public void Can_add_extension_with_command_timeout()
         Assert.Equal(30, extension.CommandTimeout);
     }
 
+    [ConditionalFact]
+    public void ParameterizedCollectionMode_is_preserved_after_clone()
+    {
+        var optionsBuilder = new DbContextOptionsBuilder();
+        optionsBuilder.UseNpgsql("Database=Crunchie", b =>
+        {
+            b.UseParameterizedCollectionMode(ParameterTranslationMode.MultipleParameters);
+            b.UsePostgresVersion(new Version(17, 0));
+        });
+
+        var extension = optionsBuilder.Options.Extensions.OfType<NpgsqlOptionsExtension>().Single();
+
+        Assert.Equal(ParameterTranslationMode.MultipleParameters, extension.ParameterizedCollectionMode);
+    }
+
     [ConditionalFact]
     public void Can_add_extension_with_connection_string()
     {