[do-not-merge] feat: new edge function upload

[pieh]

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Summary

Part of https://linear.app/netlify/issue/RUN-2937/implement-end-to-end-env-vars-plumbing-for-functions

Very initial. Also expecting this to fail as-is, because this also depend on netlify/open-api#650 - opened already just for code changes visibility, but will need to bump @netlify/api (which depends on @netlify/open-api)

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📊 Benchmark results

Comparing with e6fbebc

• Dependency count: 1,127 (no change)
• Package size: 379 MB ⬆️ 0.00% increase vs. e6fbebc
• Number of ts-expect-error directives: 359 (no change)