Use ArrayPool for int arrays in UPDATES query

[Copilot]

Replace heap allocations with pooled arrays in LoadMultipleUpdatesRows to reduce GC pressure in high-throughput scenarios.

Changes:

• Rent ids and numbers arrays from ArrayPool<int>.Shared instead of allocating
• Wrap method body in try-finally to ensure arrays are returned to pool
• Update Array.Sort to use range overload: Array.Sort(ids, 0, count)
• Create exact-sized arrays via AsSpan(0, count).ToArray() when passing to Npgsql (required by API)

Implementation:

var ids = ArrayPool<int>.Shared.Rent(count);
var numbers = ArrayPool<int>.Shared.Rent(count);

try
{
    // Use pooled arrays for all intermediate operations
    Array.Sort(ids, 0, count);
    
    // ... batch operations ...
    
    // Create properly-sized arrays only for Npgsql
    var idsArray = ids.AsSpan(0, count).ToArray();
    updateCmd.Parameters.Add(new NpgsqlParameter<int[]> { TypedValue = idsArray, ... });
}
finally
{
    ArrayPool<int>.Shared.Return(ids);
    ArrayPool<int>.Shared.Return(numbers);
}

Pooled arrays are reused for random number generation, sorting, and batch query building. Only the final parameter arrays require allocation due to Npgsql's API requirements.

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