Function check_scope 

pub fn check_scope(
    auth_ctx: Option<&AuthContext>,
    project_id: &str,
    benchmark: Option<&str>,
    scope: Scope,
) -> Result<(), (StatusCode, Json<ApiError>)>

Checks if the current auth context has the required scope, project access, and benchmark access. Returns an error response if the scope is not present, project mismatch, or benchmark restricted.