Error on completely failed stitch by default

[GiudGiud]

Motivation

Some users are trying to stitch meshes without aligning the two sidesets

we could align the sidesets for them, but it would be more cost efficient to just add an error message

Design

Add an error

Impact

Less user support

[DanielYankura]

Were you looking an error message for when it's unable to stitch any nodes between two sidesets, or for an error message if it fails to merge all the nodes in one sideset into the other?

[GiudGiud]

that one

for when it's unable to stitch any nodes between two sidesets