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Pants

<https://github.com/pantsbuild/pants/pull/17334> got a makeover and is now a PR adding a `per_platform` object :eyes:

It's usage right now is scoped to asset's sources field, specifically for `http_source` objects:
```file(
    source=per_platform(
        linux_x86_64=http_source(...),
        linux_arm64=http_source(...),
    )
)```
:warning: One warning (also in the docstring) :warning:
This SHOULD NOT be used today for the `source` field for a source file. Otherwise we'd (implicitly through dep inference) have platform-dependent dependency graphs, which the engine doesn't support. (It technically could, and maybe will, for targets WITHOUT a dependency field, but the blanket statement is a very fair warning)

<@UB2J9BQA0> (and <@U06A03HV1>) I think we could technically use this for the successor to `resource`  to fix <https://github.com/pantsbuild/pants/issues/16900> IFF the new successor doesn't have a dependencies field (which idk maybe desirable?).