SMS tasks, use shared trait, move some functions to it

[eileenmcnaughton]

This just moves 2 functions that are the same over (changing one to be use the token processor as including domain tokens is good)

I will move other functions from the static class to the trait in follow ups

[civibot]

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[eileenmcnaughton]

ok test fail is cos the gencode one needs to be merged & then I need to do a small follow up to unbreak again if running Smarty2

[eileenmcnaughton]

test this please