Fix schema confusion when integrating EF Core with Marten

[jeremydmiller]

Summary

• Fixes Schema confusion when integrating EF Core with Marten #4175: When EF Core entities have an explicit schema configured (e.g., via HasDefaultSchema or ToTable("name", "schema")), AddEntityTablesFromDbContext no longer moves those tables into Marten's schema
• Tables without an explicit EF Core schema continue to be moved to the Marten schema (preserving existing behavior)

Test plan

• should_respect_ef_core_explicit_schema_and_not_move_tables_to_marten_schema — verifies tables with explicit EF Core schema stay in that schema
• should_move_tables_without_explicit_schema_to_marten_schema — verifies existing behavior is preserved

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