fix(SDK): Artifact upload fails when same file referred multiple times

[destifo]

• [x] fix the bug where duplicate artifact references causing failure during resolution during runtime.
• [x] add sync mode tests for Python and Deno runtime.
• [ ] add other edge test cases to artifact upload.
  • [x] test for no artifact in typegraph
  • [x] test for duplicate artifact reference in the same typegraph

Issue: MET-501

Migration notes

No Migrations Needed

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