[ruby/prism] Fix parser translator ast for regex with line continuation

Turns out, the vast majority of work was already done with handling the same for heredocs

I'm confident this should also apply to actual string nodes (there's even a todo for it) but
no tests change if I apply it there too, so I can't say for sure if the logic would be correct.
The individual test files are a bit too large, maybe something else would break that currently passes.

Leaving it for later to look more closely into that.

https://github.com/ruby/prism/commit/6bba1c54e1

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