Test: Terminal command navigation improvements

[Tyriar]

Refs: #198041

• macOS @sandy081
• linux @andreamah
• windows @bhavyaus

Complexity: 3

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Since sticky scroll (#199240) and the command highlight (#199237) features are built upon the same infrastructure as command navigation, it also saw several improvements this iteration. Docs on the feature: https://code.visualstudio.com/docs/terminal/shell-integration#_command-navigation

Here are some of the changes/things to test:

• The entire prompt should now be highlighted, including a single focus rectangle around all whole prompt lines
• The feature should be more reliable now, try holding cmd/ctrl+up or down and make sure it works (it used to loop around in some circumstances)
• It should play nicely with sticky scroll
• After scrolling, it should be positioned giving a little context above unless the entire prompt was already in the viewport

[sandy081]

Works well 👏

[bhavyaus]

Works well 👏

+1 👏