Unnecessary null check for StartsWith

[roji]

_ = await ctx.Blogs
    .Where(b => b.Name.StartsWith("hello"))
    .ToListAsync();

SQL:

SELECT [b].[id], [b].[name]
FROM [blogs] AS [b]
WHERE [b].[name] IS NOT NULL AND ([b].[name] LIKE N'hello%')

/cc @maumar

[roji]

Ah, seems like that bit in QueryOptimizingExpressionVisitor I always forget (and complain) about.

[ranma42]

Currently EFCore emits

SELECT [b].[BlogId], [b].[Name]
FROM [Blogs] AS [b]
WHERE [b].[Name] LIKE N'hello%'

as it should :)

[roji]

Thanks @ranma42! Done as part of #31482