R2-3182: Remove wrangler Banner from R2 GetObject in Pipe Mode

[helloimalastair]

Fixes R2-3182.

When using the --pipe flag for wrangler r2 object get, outputting the wrangler header breaks the file that is created, since it isn't actually a part of the object content.

---

• Tests
  • Tests included
  • Tests not necessary because:
• Wrangler / Vite E2E Tests CI Job required? (Use "e2e" label or ask maintainer to run separately)
  • I don't know
  • Required
  • Not required because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: No changes to what the user needs to do to use the command.
• Wrangler V3 Backport
  • Wrangler PR:
  • [] Not necessary because:

[changeset-bot]

🦋 Changeset detected

Latest commit: c74e797

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
wrangler	Patch
@cloudflare/vitest-pool-workers	Patch

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commit: c74e797

[penalosa]

@helloimalastair this will need a backport

[emily-shen]

this behaviour has in fact regressed several times across various commands 🥲 - would you be able to add a test?

we mock out the banner in tests so you'll have to add vi.unmock("../wrangler-banner");