Raise error if build config is incompatible with cloud compute

[awaelchli]

🚀 Feature

Generate an error when a custom image is specified through the build config and the default cloud compute is selected.

Motivation

#14125
#14230 (comment)

Pitch

Validate the setting of Work.cloud_compute and Work.build_config. If it is incompatible (e.g. custom image + default cpu), raise an error.

Alternatives

Additional context

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