`snapcraft remote-build` does not support long syntax of the `architectures` top-level key.
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Issue body
This in the recipe:
```
architectures:
- build-on: amd64
build-for: amd64
- build-on: arm64
build-for: arm64
- build-on: armhf
build-for: armhf
- build-on: ppc64el
build-for: ppc64el
```
triggers, this:
```
Issues while validating snapcraft.yaml: The 'architectures[0]' property does not match the required schema: additional properties are not allowed ('build-for' was unexpected) or orderedDict([('build-on', 'amd64'), ('build-for', 'amd64')]) is not of type 'string'
```
Which conflicts what the documentation says: <https://forum.snapcraft.io/t/architectures/4972#heading--core22>
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