feat: prefer presigned download_url from upload response

@zen-agentchecks n/achecks…zen/private-file-storage → next1 files · +9 −2updated 3mo ago

▸Description

Description

Use the download_url from the upload API response instead of constructing public R2 URLs in the Mercury file upload test helper. Falls back to the admin download API when download_url is not present (backward compat).

Depends on: ComposioHQ/hermes#8266 (adds download_url to the upload API response)

How did I test this PR

Code review only — this is in test resources, not production code
The change is backward-compatible: falls back to the admin download API when download_url is not in the response

Triggered by: prateek@composio.dev | Source: slack

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