Suppress some Wrangler output when running wrangler setup from C3

[penalosa]

Fixes https://jira.cfdata.org/browse/DEVX-2363

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• Tests
  • [x] Tests included/updated
  • [ ] Tests not necessary because:
• Public documentation
  • [ ] Cloudflare docs PR(s):
  • [x] Documentation not necessary because: tracked elsewhere
• Wrangler V3 Backport
  • [ ] Wrangler PR:
  • [x] Not necessary because: not a wrangler change

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 91c9facbfe744c084bc36d6751587cb0b74965fc

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

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[pkg-pr-new[bot]]

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wrangler

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commit: 91c9fac

[claude[bot]]

Claude finished @penalosa's task —— View job

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Changeset Review Complete

✅ All changesets look good

I've reviewed .changeset/plain-cameras-cheer.md against the changeset guidelines in .changeset/README.md. Here's what I validated:

Version Types ✅

• create-cloudflare: minor - Correct. Adding new CLI flags (even hidden ones) that enable new functionality is a minor change.
• wrangler: minor - Correct. Adding new CLI flags (--no-completion-message and --no-install-wrangler) qualifies as a minor version bump per the guidelines: "new CLI commands, new configuration options".

Changelog Quality ✅

• Clear title describing what was added
• Helpful body explaining the two new flags and their purpose
• Includes context on why these flags exist (for create-cloudflare integration)

Markdown Headers ✅

• No h1/h2/h3 headers that would break changelog formatting

Notes

Regarding the review comment about whether these should be patches: The changeset guidelines define minor versions as including "new CLI commands, new configuration options" - since these are new CLI flags (configuration options), minor is the appropriate version bump type, even though the flags are hidden. The author's classification is correct.