Allow conventions to update ValueGenerated

Reacting to dotnet/efcore#7205

Note that this was done a long time ago in EFCore (2.0.0) but only
now discovered thanks to the internal analyzer warnings.

src/EFCore.PG/Metadata/Internal/NpgsqlPropertyBuilderAnnotations.cs

@@ -22,8 +22,6 @@ public NpgsqlPropertyBuilderAnnotations(
         {
         }
 
-        private InternalPropertyBuilder PropertyBuilder => ((Property)Property).Builder;
-
         /// <summary>
         ///     This API supports the Entity Framework Core infrastructure and is not intended to be used
         ///     directly from your code. This API may change or be removed in future releases.
@@ -59,31 +57,19 @@ public NpgsqlPropertyBuilderAnnotations(
         ///     This API supports the Entity Framework Core infrastructure and is not intended to be used
         ///     directly from your code. This API may change or be removed in future releases.
         /// </summary>
-        public new virtual bool DefaultValueSql([CanBeNull] string value)
-        {
-            PropertyBuilder.ValueGenerated(ValueGenerated.OnAdd, ConfigurationSource.Convention);
-            return SetDefaultValueSql(value);
-        }
+        public new virtual bool DefaultValueSql([CanBeNull] string value) => SetDefaultValueSql(value);
 
         /// <summary>
         ///     This API supports the Entity Framework Core infrastructure and is not intended to be used
         ///     directly from your code. This API may change or be removed in future releases.
         /// </summary>
-        public new virtual bool ComputedColumnSql([CanBeNull] string value)
-        {
-            PropertyBuilder.ValueGenerated(ValueGenerated.OnAddOrUpdate, ConfigurationSource.Convention);
-            return SetComputedColumnSql(value);
-        }
+        public new virtual bool ComputedColumnSql([CanBeNull] string value) => SetComputedColumnSql(value);
 
         /// <summary>
         ///     This API supports the Entity Framework Core infrastructure and is not intended to be used
         ///     directly from your code. This API may change or be removed in future releases.
         /// </summary>
-        public new virtual bool DefaultValue([CanBeNull] object value)
-        {
-            PropertyBuilder.ValueGenerated(ValueGenerated.OnAdd, ConfigurationSource.Convention);
-            return SetDefaultValue(value);
-        }
+        public new virtual bool DefaultValue([CanBeNull] object value) => SetDefaultValue(value);
 
         /// <summary>
         ///     This API supports the Entity Framework Core infrastructure and is not intended to be used
@@ -113,15 +99,12 @@ public NpgsqlPropertyBuilderAnnotations(
             case NpgsqlValueGenerationStrategy.SerialColumn:
             case NpgsqlValueGenerationStrategy.IdentityAlwaysColumn:
             case NpgsqlValueGenerationStrategy.IdentityByDefaultColumn:
-                PropertyBuilder.ValueGenerated(ValueGenerated.OnAdd, ConfigurationSource.Convention);
                 HiLoSequenceName(null);
                 HiLoSequenceSchema(null);
                 break;
             case NpgsqlValueGenerationStrategy.SequenceHiLo:
-                PropertyBuilder.ValueGenerated(ValueGenerated.OnAdd, ConfigurationSource.Convention);
                 break;
             case null:
-                PropertyBuilder.ValueGenerated(ValueGenerated.Never, ConfigurationSource.Convention);
                 HiLoSequenceName(null);
                 HiLoSequenceSchema(null);
                 break;