Fix tab selection to bring the tab into view (microsoft#8832)

## PR Checklist
* [x] Closes microsoft#3638
* [x] CLA signed.
* [ ] Tests added/passed
* [ ] Documentation updated.
* [ ] Schema updated.
* [x] I've discussed this with core contributors already.

##Detailed Description of the Pull Request / Additional comments
A workaround for microsoft/microsoft-ui-xaml#3945.
Thanks to @michael-hawker and @chingucoding for the suggested solution.

src/cascadia/TerminalApp/TerminalPage.cpp

@@ -2208,6 +2208,8 @@ namespace winrt::TerminalApp::implementation
                     _UpdateMRUTab(index);
                 }
 
+                tab.TabViewItem().StartBringIntoView();
+
                 // Raise an event that our title changed
                 _titleChangeHandlers(*this, tab.Title());
             }