Where_compare_constructed_multi_value_not_equal: anonymous object equality should use value semantics

Query is:

```C#
ss.Set().Where(c => new { x = c.City, y = c.Country } != new { x = "London", y = "UK" })
```

The MongoDB provider supports this and returns correct results. For example:

```C#
context.AddRange(
new Customer { CustomerID = "1", Country = "UK", City = "abc" },
new Customer { CustomerID = "2", Country = "USA", City = "London" },
new Customer { CustomerID = "101", Country = "UK", City = "London" },
new Customer { CustomerID = "102", Country = "UK", City = "jkl" });

context.SaveChanges();

var results = context.Set()
.Where(c => new { x = c.City, y = c.Country } != new { x = "London", y = "UK" })
.ToList();

foreach (var result in results)
{
Console.WriteLine($"Found {result} {result.City} { result.Country}");
}

```

Prints all results that are not London, UK:

```
info: 22/07/2025 13:23:16.815 MongoEventId.ExecutedMqlQuery[35000] (Microsoft.EntityFrameworkCore.Database.Command)
Executed MQL query
SomeDb5.Customers.aggregate([{ "$match" : { "$expr" : { "$ne" : [{ "x" : "$City", "y" : "$Country" }, { "x" : "London", "y" : "UK" }] } } }])
Found Customer abc UK
Found Customer London USA
Found Customer jkl UK
```

But Linq to Objects:

```C#
var results = context.Set()
.ToList()
.Where(c => new { x = c.City, y = c.Country } != new { x = "London", y = "UK" })
.ToList();
```

Which the test uses for verification, returns:

```
info: 22/07/2025 13:26:00.213 MongoEventId.ExecutedMqlQuery[35000] (Microsoft.EntityFrameworkCore.Database.Command)
Executed MQL query
SomeDb5.Customers.aggregate([])
Found Customer abc UK
Found Customer London USA
Found Customer London UK
Found Customer jkl UK

```

This includes London, UK, presumably because the object references don't match.