fixes#9730
Added a `logEvent` method to remote backend implementation in dashboard. Added an always-present remote backend instance that can be used for logging even when running a local project (intentional behavior).
# Important Notes
Because the backend implementation requires access to always fresh session token, the logger needs to be periodically updated on GUI side, so it can continue to function. To accomplish that, I simplified the app loading logic to treat GUI as an ordinary react component, so its props can be updated with normal react rendering flow. That refactor also removed the dynamic GUI asset loading code that was only needed for Rust GUI.
Part of #8518Closes#8822
The drop downs were missing, because WidgetFunction had a higher score than them and took precedence. The fix was to adjust scores, so drop down is before both argument name and function. Generally, any widget expecting to "overlap" existing code (and possibly further widgets) should go before WidgetFunction.
# Important Notes
* Extended mockExpressionUpdate to accept a subexpression of a node. Also, I removed it from GraphDb - I want this function to have as little impact on app code as possible.
Related to https://github.com/enso-org/enso/issues/8518
These tests already caught one regression in nav breadcrumbs: https://github.com/enso-org/enso/issues/8756
It also provides API for mocking expression updates for arbitrary nodes on the screen. The implementation is a bit convoluted and includes setting a callback on `window`, but it looks like the only possible solution given our architecture and playwright restrictions.
