Added buildReplaceStringWithCasePreserved generic function to be  used in both search side and the find side

- make it unlikely that a new view instance would accept a view zone id from a previous view instance
- remove that the find widget removes a view zone id from another view
(fixes #71745)

- We use alert from aria base

We seem to use the readonly property way of exposing these values more widely. Standardizing this a bit across the codebase

- We would like to notify the user about the results we found
the screen reader will read out the number of results or no result
aria-live is added at load, as it cannot be added adhoc

Not possible to explicitly change the foreground text color for widgets. Fixes microsoft/vscode#76274