Fix regression to allow LIKE translation for string comparison queries with non-constant args

[po-gl]

Closes #386

Resolves regression introduced during the upgrade to .NET 10 (4ac27f6)

In EF Core 9, the .Name property on SqlParameterExpression was prefixed with "__", i.e. QueryCompilationContext.QueryParameterPrefix. In EF Core 10, the prefix was removed as they were no longer needed to distinguish between parameter types (dedicated types were introduced). The prefix was not replaced with "@" or any other symbol, thus the existing guard in GetLikeExpressionUsingParameter will always fail. Similar guard statements were removed in EF Core 10 for the first party Sql server and Sqlite EFCore implementations.

Removing the guard allows the translator to use LIKE expressions for StartsWith, EndsWith, and Contains methods with non-constant arguments. For example, the following query (excerpt from repro code in issue):

await context.Widgets.Where(x => x.Name.StartsWith(pattern)).FirstOrDefaultAsync();

will translate to the following SQL with the changes from this PR:

SELECT `w`.`Id`, `w`.`Name`
FROM `Widgets` AS `w`
WHERE `w`.`Name` LIKE @pattern_startswith
LIMIT 1