Fix EF Core 10 migration: Remove obsolete test fixture base classes

[Copilot]

EF Core 10 removed SingletonInterceptorsFixtureBase and NonSharedModelBulkUpdatesFixtureBase, replacing them with a simplified NonSharedFixture pattern using primary constructors.

Changes

• MaterializationInterceptionMySqlTest.cs: Replaced custom MySqlMaterializationInterceptionFixture with NonSharedFixture injection via primary constructor
• NonSharedModelBulkUpdatesMySqlTest.cs: Replaced custom MySqlNonSharedModelBulkUpdatesFixture with NonSharedFixture injection via primary constructor

Before/After

// Before (EF Core 9)
public class MaterializationInterceptionMySqlTest : MaterializationInterceptionTestBase<...>
{
    public MaterializationInterceptionMySqlTest()
        : base(new MySqlMaterializationInterceptionFixture())
    { }
    
    public class MySqlMaterializationInterceptionFixture : SingletonInterceptorsFixtureBase
    {
        protected override IServiceCollection InjectInterceptors(...) => ...;
    }
}

// After (EF Core 10)
public class MaterializationInterceptionMySqlTest(NonSharedFixture fixture) :
    MaterializationInterceptionTestBase<...>(fixture)
{
}

Aligns with EF Core 10's SqlServer and Sqlite provider test patterns.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Handle migration to .net 10 compliation errors</issue_title>
<issue_description>We have these errors, that needs to be addressed for being able to migrate to .net 10:

Error: /home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/MaterializationInterceptionMySqlTest.cs(35,60): error CS0246: The type or namespace name 'SingletonInterceptorsFixtureBase' could not be found (are you missing a using directive or an assembly reference?) [/home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/EFCore.MySql.FunctionalTests.csproj]
Error: /home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/MaterializationInterceptionMySqlTest.cs(41,13): error CS0246: The type or namespace name 'IServiceCollection' could not be found (are you missing a using directive or an assembly reference?) [/home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/EFCore.MySql.FunctionalTests.csproj]
Error: /home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/MaterializationInterceptionMySqlTest.cs(42,13): error CS0246: The type or namespace name 'IEnumerable<>' could not be found (are you missing a using directive or an assembly reference?) [/home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/EFCore.MySql.FunctionalTests.csproj]
Error: /home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/MaterializationInterceptionMySqlTest.cs(42,25): error CS0246: The type or namespace name 'IInterceptor' could not be found (are you missing a using directive or an assembly reference?) [/home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/EFCore.MySql.FunctionalTests.csproj]
Error: /home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/MaterializationInterceptionMySqlTest.cs(40,28): error CS0246: The type or namespace name 'IServiceCollection' could not be found (are you missing a using directive or an assembly reference?) [/home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/EFCore.MySql.FunctionalTests.csproj]
Error: /home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/BulkUpdates/NonSharedModelBulkUpdatesMySqlTest.cs(20,58): error CS0246: The type or namespace name 'NonSharedModelBulkUpdatesFixtureBase' could not be found (are you missing a using directive or an assembly reference?) [/home/runner/work/Pomelo.EntityFrameworkCore.MySql/Pomelo.EntityFrameworkCore.MySql/test/EFCore.MySql.FunctionalTests/EFCore.MySql.FunctionalTests.csproj]
```</issue_description>

<agent_instructions>Investigate ef core codebase to figure, what is needed to migrate these parts of the code, so we do not have these errors.</agent_instructions>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes Handle migration to .net 10 compliation errors #96

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