feat: Return to previous tab when closing tabs, p=#11933

* fix: Switch to last used tab on tab close

lastAccessed time will be used to select the active tab instead of positional selection or ownership when a tab is closed, returning the user to their last used tab.

* test: Merge branch and add tests, b=no-bug, c=common, tests, tabs, workspaces

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Co-authored-by: mr. m <91018726+mr-cheffy@users.noreply.github.com>

src/zen/workspaces/ZenWorkspaces.mjs

@@ -2819,9 +2819,8 @@ class nsZenWorkspaces {
     const tabWorkspaceId = aTab.getAttribute("zen-workspace-id");
     const containerId = aTab.getAttribute("usercontextid") ?? "0";
     // Return all tabs that are not on the same workspace
-    return this.allStoredTabs.filter(
+    return gBrowser.tabs.filter(
       (tab) =>
-        tab.getAttribute("zen-workspace-id") !== tabWorkspaceId &&
         !this._shouldShowTab(tab, tabWorkspaceId, containerId, this._workspaceCache) &&
         !tab.hasAttribute("zen-empty-tab")
     );