[Playground] [Task]: Use keyed_collection_widgets for tabs in 'Share code' and Output tabs
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beam-playground
improvement
P4
task
- Dominant language
- Java
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Description
### What needs to happen?
This package provides safer tab management than the default Flutter tab widgets:
https://pub.dev/packages/keyed_collection_widgets
We should use it for tabs in a pop-up when sharing a snippet:

### Issue Priority
Priority: 3
### Issue Component
Component: beam-playground
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