[PrSelection] spell out templated typenames in exceptions

Rather than putting bare <T> into the gaudi exception explanation, we can use the compile-time known type name. It might not resolve all questions one might face when seeing the exception, but at least disambiguates if incompatible track, particle, younameit selections are overflowing/setoperated.

@pseyfert it tells me the CI failed, but I don't have access to your repository to see why. Should I be worried?

well it complains about missing copyrights in files I didn't touch

I filed that under SEP.

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• 7532d39c - Define details::typename_v helper following @graven's suggestion.

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mentioned in merge request !1281 (merged)