Change backport action to accept target versions for porting via checkboxes and select current issue's version from a list #8236
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Description
In the current backport GitHub action, the user enters the current version of the issue being ported and automatically ports to all other versions.
This change displays the current version as a choice list (from which the user chooses one) and present check boxes for the versions to port to with the other releases defaulted for porting to.
There is no validity checking in the yaml but the changes to the bash script, as before, make sure to not create another issue targeted to the same version as the original script.
I kept the same defaults--existing issue version is 2.x and default targets are 3.x and 4.x--for compatibility with the original action but we could certainly change that. I think it's probably now a more frequent use case that we port from 4.x to 3 and/or 2.