fix: remove appended string to firebase tools response which cause fo…

[stMerlHin]

Description

This PR contains changes which remove }{ "status": "error", "error": "Timed out." } from response returned by the firebase tools. It is appended to the response and causes the CLI to throw format exception.

• Fixes #262

Type of Change

• [ ] ✨ feat -- New feature (non-breaking change which adds functionality)
• [x] 🛠️ fix -- Bug fix (non-breaking change which fixes an issue)
• [ ] ❌ ! -- Breaking change (fix or feature that would cause existing functionality to change)
• [ ] 🧹 refactor -- Code refactor
• [ ] ✅ ci -- Build configuration change
• [ ] 📝 docs -- Documentation
• [ ] 🗑️ chore -- Chore

[CLAassistant]

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[russellwheatley]

@stMerlHin - thank you for the PR and raising the issue, I have opened another one which tests the update: https://github.com/invertase/flutterfire_cli/pull/288

Hope you don't mind 😄