Docs: Cover the minimum versions for build providers
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### What needs to get done
- We should store this info in [System requirements](https://github.com/canonical/snapcraft/blob/main/docs/reference/system-requirements.rst). We could add a section that's split by core versions, and when core22 is deprecated we could unify it.
- We should also add is as a requirement to the [core22 migration guide](https://snapcraft.io/docs/migrate-core22), while it's still active.
### Why it needs to get done
As was [pointed out recently on Discourse](https://forum.snapcraft.io/t/base-snaps/11198/24), we don't supply compatibility information for build providers.
Although they act as middleware, users can't build snaps without one. It stands to reason that users ought to know the minimum versions they'll require.
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