We've got time to update dependencies and to move to React 19.

Our partner extension has done this job and the related PR can be reviewed here:
microsoft/vscode-cosmosdb#2760

The task is to apply the changes made there in our codebase.
Focus on configuration changes, on package.json changes, and the required changes in the code base.
Not all changes made in sources in the vscode-cosmosdb project are needed as our feature implementations differ, especially around webviews. Focus on concepts, not a verbatim copy.

Leave a summary of concepts applied in our code base and concepts left or future consideration.