Add the glm_params when redirecting to new_trial_registration_path

What does this MR do and why?

When the user requests /-/trials/new without login, it will be redirect to /-/trial_registrations/new, at which point the glm_params are lost. If the user login or registers and creates a trial, it will not be able to carry the glm_params. Therefore, I think we should add the glm_params when redirecting to /-/trial_registrations/new.

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/cc @daveliu @tianlu1677