[FEATURE] Identify and update file-related sources to optionally emit file download URL

[michelle0927]

Issue #18218 describes how to use Pipedream's File Stash to create a temporary, pre‑signed URL for a file. File-related sources should provide an optional prop, includeLink, to emit this URL in the source event.

PR #18269 addresses several, but not all, of these file-related sources.

Identify remaining file-related sources in the Pipedream repo, and update them to optionally include a download link in the event.