Bug 1933114 Comment 1 Edit History

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- added API to retrieve saved tab groups
- retain closing window if it has any closed tab groups with tabs worth saving
- allow `sourceWindow` as a closed data source
- handle the current schema differences between saved group tabs and closed group tabs
Also addresses bug 1933574 by changing the schema of saved tab groups so that they look the same as closed tab groups (that is, the saved tab groups' tabs list now has the same schema as the _closedTabs list).

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