feat: allow hash table with file list for spack cherry-picks

We try to stick to a spack release with selected cherry-picks. Occasionally, spack has a treewide commit that breaks this because all subsequent cherry-picks need the treewide commit to apply successfully, and applying the treewide commit as a cherry-pick would require essentially every commit since the release. This PR adds the ability to apply partial cherry-picks, restricted to just the specified files. This allows is to apply the treewide commit on only the files that need it.

assigned to @wdconinc

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• 0b396455 - fix: use SPACK_CHERRYPICKS_FILES to set SPACK_CHERRYPICKS_FILES_ARRAY

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• e86bdaa4 - fix: quote array test evaluation

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• c3f63f04 - fix: apply initial license checkin for hepmc3 and pythia8

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changed the description

requested review from @sly2j

enabled an automatic merge when the pipeline for c3f63f04 succeeds

mentioned in merge request !823 (merged)

merged