`..BuilderExtension` methods are called as `...BuilderExtensions.Method()` instead of `.Method()` in migrations

[lauxjpn]

Currently, extension methods are called in migrations as in the following example:

modelBuilder.Entity("IssueConsoleTemplate.IceCream", b =>
    {
        b.Property<int>("IceCreamId")
            .ValueGeneratedOnAdd()
            .HasColumnType("int");

        MySqlPropertyBuilderExtensions.UseMySqlIdentityColumn(b.Property<int>("IceCreamId"));

        b.Property<string>("Name")
            .HasColumnType("longtext");

        MySqlPropertyBuilderExtensions.HasCharSet(b.Property<string>("Name"), "latin1");
    }):

A better representation would be the following one (which I believe has worked in some earlier release trains):

modelBuilder.Entity("IssueConsoleTemplate.IceCream", b =>
    {
        b.Property<int>("IceCreamId")
            .ValueGeneratedOnAdd()
            .HasColumnType("int")
            .UseMySqlIdentityColumn("IceCreamId");

        b.Property<string>("Name")
            .HasColumnType("longtext")
            .HasCharSet("latin1");
    }):

Technical details (please complete the following information):

• Pomelo.EntityFrameworkCore.MySql version: at least in 9.0 (need to check other release trains)