Warn if `--platform` is used for remote builds
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Issue body
### What needs to get done
Snapcraft should error when `--platform` is used with remote-build and recommend using `--build-for`.
### Why it needs to get done
`--platform` was dropped in Snapcraft 8.7.0 because it rarely worked as expected. The only deprecation notices were in the release notes and forum, not in Snapcraft itself.
Based on feedback from @simondeziel
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