Accept build-for: [all] and --build-for=all for architecture-independent snaps

[lengau]

What needs to get done

Depends on: canonical/craft-application#360

Add tests to ensure this works on Snapcraft for both core22 and core24, and fix any issues when doing this.

Why it needs to get done

This is a core24 regression: https://forum.snapcraft.io/t/architectures/4972/25

[syncronize-issues-to-jira]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3017.

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