Compiler warning CA1839 on DbSet.Add

Since updating to .NET 8 Preview 7, all calls to `DbSet.Add(TEntity entity)` and `DbSet.AddRange(params TEntity[] entities)` result in a CA1839 compiler warning.

For example, calling `context.Users.Add(user);` results in:

> Warning CA1849 'DbSet.Add(User)' synchronously blocks. Await 'DbSet.AddAsync(User, CancellationToken)' instead.

However, the summary for `AddAsync` reads:

> This method is async only to allow special value generators, such as the one used by 'Microsoft.EntityFrameworkCore.Metadata.SqlServerValueGenerationStrategy.SequenceHiLo', to access the database asynchronously. For all other cases the non async method should be used.

Should this warning be suppressed by default?