[Task][Playground][Frontend]: Convert PlaygroundController from ChangeNotifier to Stream

Open

#25,185 opened on Jan 26, 2023 1 comment 0 reactions 1 assignee Claimed by @nausharipov View on GitHub

P3 task

Description

### What needs to happen?

Detailed description will be added later.

### Issue Priority

Priority: 3 (nice-to-have improvement)

### Issue Components
Tour of Beam

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