Handle multi-arch builds in destructive mode

[mr-cal]

What needs to get done

When running in destructive mode, snapcraft should do one of the following:

This issue is referenced in the documentation and should be updated when completed. (both readthedocs and snapcraft.io/docs)

option 1

organize craft-parts directories by architecture:

my-snap-project
├─ amd64
│  ├── parts
│  ├── prime
│  └── stage
└─ arm64
   ├── parts
   ├── prime
   └── stage

option 2

store the architecture in the craft-parts state file and clean between builds of different architectures

Why it needs to get done

Consider the snapcraft.yaml snippet:

base: core22
architectures:
  - build-on: amd64
    build-for: amd64
  - build-on: amd64
    build-for: arm64

When snapcraft --destructive-mode is executed, it will build for amd64 and then for arm64.
On the build for arm64, all steps will be skipped. There is no isolation between the builds.

This is not a problem for core20 snaps.

[mr-cal]

Update: We are allowing this behavior in core22 but raising a warning message.