This new site setting replaces the
`enable_experimental_sidebar_hamburger` and `enable_sidebar` site
settings as the sidebar feature exits the experimental phase.
Note that we're replacing this without depreciation since the previous
site setting was considered experimental.
Internal Ref: /t/86563
This implementation attempts to be more resilient to background tab.
Notes:
- adds support for immediate arg in @debounce decorators
- fixes a bug in discourseDebounce which was not supporting immediate arg in tests
- chat-audio-manager has no tests as audio requires real user interaction and is hard to test reliably
