[Task]: A single method for dropdown overlays in frontend
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beam-playground
improvement
P4
task
- Dominant language
- Java
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Description
### What needs to happen?
Currently Playground uses legacy classes for its dropdowns:
1. https://github.com/apache/beam/blob/fd7e86269fa7d7827c2799b613eeea094a070491/playground/frontend/lib/components/dropdown_button/dropdown_button.dart#L37
2. https://github.com/apache/beam/blob/fd7e86269fa7d7827c2799b613eeea094a070491/playground/frontend/lib/modules/examples/example_selector.dart#L39
And the code is duplicated there.
Need to use a single lightweight routine for all dropdown overlays in Playground and Tour of Beam. It is being prepared in #23692
### Issue Priority
Priority: 3
### Issue Component
Component: beam-playground
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