[wrangler] Remove pubsub subcommands (no longer available)

[elithrar]

The Pub/Sub product was never made publicly available and has been discontinued. This PR removes the wrangler pubsub subcommand and all related functionality.

• Removes pubsub CLI commands (pubsub namespace, pubsub broker, etc.)
• Removes associated test files
• Removes pubsub-related metrics event types
• Updates help output snapshots

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• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because: removal of unused code
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: feature was never publicly documented

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[changeset-bot]

🦋 Changeset detected

Latest commit: ba30187

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

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[claude]

Claude finished @elithrar's task —— View job

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Changeset Review

Reviewing changeset file...

Todo:

• Read changeset guidelines
• Read changeset file
• Validate changeset
• Post results

---

✅ All changesets look good

The changeset .changeset/remove-pubsub.md is valid:

• Version type: patch is appropriate for removing unused/deprecated functionality
• Description: Clear and well-formatted with a title and explanatory body
• Markdown headers: None present (✓)
• Analytics: Not applicable for this removal
• Package coverage: Correctly lists wrangler as the affected package

[devin-ai-integration]

Devin Review found 1 potential issue.

View issue and 3 additional flags in Devin Review.

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commit: ba30187

[petebacondarwin]

TODO for @petebacondarwin - remove this in a follow up as the containers commands no longer use it either.