Test: Pinned Editors

[bpasero]

Refs: #98161

• macOS @alexdima
• linux @aeschli
• windows @lszomoru

Complexity: 3

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Pinned editors changed to address a couple of issues:

• verify the new setting workbench.editor.pinnedTabSizing works as advertised in all the three modes (compact, shrink, normal) with normal being the default (refs Pinned tabs: add a setting to show more context #98161)
• verify you see pinned tabs with a pin icon where usually the close button is and you can unpin from there when in mode shrink and normal).
• verify you see the same pin icon also in "open editors" view
• verify you cannot close a pinned tab via CtrlCmd+W when it is active, rather the next tab in the group gets active so that another invocation closes that tab (refs: Prevent closing the pinned tab when using Ctrl + W #100738)
• verify you can bind CtrlCmd+W to the new command workbench.action.closeActivePinnedEditor to even close pinned editors
• verify you can pin an editor even when you have tabs disabled and it behaves the same (i.e. does not close from close operations). verify you see the pin-icon top right for pinned editors (refs Support pinned tabs when tabs are disabled #100211)
• verify you can customize and see tab.lastPinnedBorder, a border drawn after the last pinned tab to better distinguish pinned tabs from non-pinned tabs