regression: remote-build doesn't accept comma-seperated architectures

[mr-cal]

Bug Description

In snapcraft 8.0.1, snapcraft remote-build --architectures=amd64,arm64 fails to split a list of architectures.

This logic needs to be added to the remote-build cli handler.

To Reproduce

snapcraft remote-build --architectures=amd64,arm64

Environment

n/a

snapcraft.yaml

n/a

Relevant log output

2024-01-10 10:21:08.174 remote-build error: Architecture not supported by the remote builder.
The following architectures are not supported by the remote builder: ['amd64,arm64'].
Please remove them from the architecture list and try again.

Additional context

No response

[mr-cal]

Regression fixed in #4543

[JGCarroll]

Hi,

As of Snapcraft 8.2.7, this appears to have returned in the exact same manner as it were originally.

[mr-cal]

Thanks, unfortunately Snapcraft has regressed on this again. I will track this in a new issue.