conversion-gen: check for nil pkg in getManualConversionFunctions #55948
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What this PR does / why we need it:
Following #54394, this PR performs a check in getManualConversionFunctions for packages that are not found and prints a warning instead of panicking.
This should improve the UX of conversion-gen, and is also a narrower change than that proposed in #54394, so hopefully can be cherry picked into the release-1.8 etc. branches.
This would allow users to use conversion-gen via the generate-internal-groups.sh script without having to make a second call that 'blanks out'
--extra-peer-dirs
./cc @sttts