[wrangler] Allow r2 bucket list with invalid config

[ksawaneh]

Fixes #10682.

This makes wrangler r2 bucket list an account-level command that no longer reads/validates the local Wrangler config (wrangler.toml/wrangler.jsonc) before executing.

This unblocks listing buckets when the local config is invalid (e.g. invalid r2_buckets entries), which is especially useful when you need to inspect available buckets in order to fix the config.

---

• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: the change is self-contained and covered by tests.

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Latest commit: a2f3b6c

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commit: a2f3b6c