[#3342409] feat: redirect_form_node_form_alter calls getInternalPath on potentially unrouted url

Benjamin Melançonrequested to merge
issue/redirect-3342409:3342409-avoid-internal-path-call-on-unrouted-url into 8.x-1.x

By: danflanagan8 By: mahtab_alam By: mlncn

Closes #3342409

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