Feature request: use Ubuntu version instead of series in cache folder
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Issue body
### What needs to get done
e.g instead of using
`charmcraft-buildd-base-v5.0/BuilddBaseAlias.JAMMY/pip/`
use
`charmcraft-buildd-base-v5.0/BuilddBaseAlias.22.04/pip/`
### Why it needs to get done
This would make it easier to interact with the cache. Currently, charmcraft.yaml bases use Ubuntu version (e.g. 22.04), which needs to be converted to "JAMMY"
for example, this manually maintained mapping of version to series could be removed: https://github.com/carlcsaposs-canonical/charmcraftcache/blob/39d82eeaf28751dcc736744c3c7c42e7d06027da/charmcraftcache/main.py#L435
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