Replace util.env("WING_TARGET") with @app.target everywhere

[Chriscbr]

Use Case

Getting the current target through an environment variable is a bit weird and it requires an extra import. I think it might be better if we expose the "platform string" through a field like @app.target. This might require updating our existing platforms.

I don't think there's any critical need to deprecate the old API. But it will feel good to update our code examples and tests and winglibs to use the new syntax.

Proposed Solution

No response

Implementation Notes

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Component

Documentation

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[Chriscbr]

We could also name it simply @target

[boyney123]

Yeah I think having @app.target or @target feels clean to me. TBH I actually prefer the @target naming... for what its worth

[Chriscbr]

Added @target in #7161