feat: support arbitrarily long PACKSQUASH_SYSTEM_IDs
#102
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Background, motivation, purpose, and description
ComunidadAylas/PackSquash@bf7188d made PackSquash support arbitrarily long system ID hex strings. In addition to being somewhat safer and more scalable, such a simple format also simplifies the action a bit by doing away with the need for an external dependency for generating UUIDs. However, this new format is not backwards compatible, so care should be taken to avoid using it with older PackSquash versions. To achieve that outcome, let's leverage the version manifest system we already have to introduce such a breaking behavior bump while handling older versions of both PackSquash and the action as gracefully as possible.
For now, this PR is kept as a draft because such changes didn't make it to any stable PackSquash release, so the action with the new version manifest format wouldn't work in its most common configuration of using the latest stable version. Moreover, the CDN routes for such manifest files weren't set up either.
Usage
No significant updates to end-user workflows are expected, since in the vast majority of cases system ID handling is transparent for them. Users that have manually set a system ID can continue using the older UUID format for the time being.