remote-build: add control logic for snap base

[mr-cal]

What needs to get done

This adds control logic to determine whether to execute the new or legacy remote-build code.

Requires parsing the snapcraft.yaml and checking the base. Only core20 and core22 snaps can use the legacy remote-build code.

Devel, core24, and onwards must use the new remote-build code.

Why it needs to get done

remote-build needs to be migrated because it does not leverage the new craft libraries, has issues with building core22 snaps, and has issues related to how the local project is bundled.