Move common parts of editor and terminal hover widget into base ui #97834
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Part of #97496
The goal of this PR is to have the editor and terminal hover widgets share as much code as possible, which doesn't end up being that much. At least now terminal depends on CSS in base rather than the editor.
The plan is to follow this up with a new hover service in the workbench that will move more of the terminal hover there and simplify lifecycle management/ease of use in other parts of the workbench that want to use the fancy hovers (tabs and GH issue).