Fix subsets inheriting service chaining requirement from whole app #3136
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Fixes #2915 and #3088
This explores the approach of putting host requirements on components instead of on the app, meaning that app splitting and multi-trigger Just Work without any shenanigans.
The approach is much nicer than the previous attempt in #3093, but needs a bit more testing. The error behavious for existing trigger binaries is not lovely but that may not be possible to control since those binaries are already out there (and fixes itself when the triggers are rebuilt against these versions of the Spin crates).