Test: workspace storage closes properly on shutdown

[bpasero]

Refs: #114844

• macOS @connor4312
• linux @deepak1556
• windows @dbaeumer

Complexity: 2

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Previously, anytime you close, reload or change a window, the workspace storage would close and flush. Now, this happens only when you quit the application and is no longer bound to window lifecycle events. The intent is to make window transitions faster by not having to wait for workspace storage to close.

• open a few windows and accumulate some workspace state such as opened editors
• trigger lifecycle things in the window (reload, change folder)
• make sure your workspace state is still there when the window comes back to a workspace you had accumulated state in
• quit the application
• start again and verify the state is still there as you left it