Test rich hovers in status bar items

[aeschli]

Ref #126258

• anyOs @Tyriar
• anyOs @isidorn

Complexity: 3

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StatusBar items can now show rich content from a markdown string. Test the API and the implementation.

• Create an extension with proposed API (yo code --insiders) or modify the https://github.com/microsoft/vscode-extension-samples/blob/main/statusbar-sample
• Add a status bar item that uses the StatusBarItem.tooltip2 with a markdown string
• Test various markdown features.
  • Test command links ([test](command:vscode.newWindow)) and verify that the Markdown string needs to be trusted
  • Test http links
  • Test codicons ($(zap))
• Test that the rich hovers are shows also when the status bar item has no command (StatusBarItem.command)
• Test that the rich hovers also when the VS Code window is small