docs: add RabbitMQ admin access guide to GraphQL README

[nelitow]

Summary

Checklist

• I've added error handling for all actions/requests, and verified how this error will show on UI. (or there was no error handling)
• I've reviewed all the copy changed/added in this PR, using AI if needed. (or there was no copy changes)
• I've included the reference to the issues being closed from Github and/or Linear (or there was no issues)
• I've changed the Docs to reflect my changes (or it was not needed)
• I've put docs links where it may be helpful (or it was not needed)
• I checked the resulting UI both in Light and Dark mode (or no UI changes were made)
• I reviewed the entire PR myself (preferably, on GH UI)

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Project	Deployment	Review	Updated (UTC)
fuel-explorer-v2-vite	Ready	Preview	Jan 19, 2026 0:14am

[LuizAsFight]

we should use the port forward of the proxy that we alreaduy have in mainnet explorer pods, instead of setting up a new pod. lets simplify this doc/process