Test: terminal tabs widget

[meganrogge]

Refs #120241

• macOS @isidorn
• linux @mjbvz
• windows @RMacfarlane

Complexity: 5

Authors: @Tyriar, @meganrogge

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Note that testing terminal statuses specifically will be done in #122241

Verify that you can:

• kill & split terminals using both the inline action buttons (on hover) and the context menu
• rename and change the icon for an instance using the context menu
• keybindings surfaced in the tabs context menu work as expected
• change the location of the tabs with terminal.integrated.tabs.location or by right clicking an empty area in the tabs view and selecting the Move Tabs action in the context menu
  • navigate the tabs with the arrow keys after this, pressing enter to focus the terminal instance associated with that tab
• double click the empty area to create a new terminal
• show or hide the tabs view by changing the setting terminal.integrated.tabs.enabled or right clicking an empty area in the tabs view and selecting the Hide Tabs action
• double click the sash to toggle between a minimized view and one which displays the text with limited extra width
• focus the tabs view with the command workbench.action.terminal.focusTabsView or by using the associated keybinding
• use the + and v buttons to create new terminals (also try splitting via the submenu action), configure terminal settings, or select the default profile
• multi select tabs using ctrl/command and clicking
  • see options to kill and split enabled, change icon and rename disabled
• double click to focus the associated terminal instance
• see the "Tasks" description next to the terminal's title
• toggle between seeing the single inline tab and the multiple-tabs view depending on how many terminals there are or whether the tabs are in the narrow view (driven by terminal.integrated.tabs settings)
• use the new keybindings to navigate terminal tabs and focus the tabs widget (check the keybindings editor)

Other more exploratory items:

• experiment with other settings under the terminal.integrated.tabs namespace
• ensure tabs display correctly, an edge case to watch out for in particular here is when the panel is displayed (after a reload or not)