## Summary of the Pull Request
Adds support for two actions, `closeOtherTabs` and `closeTabsAfter`. Both these actions accept an `index` parameter.
* `closeOtherTabs`: Close tabs other than `index`
* `closeTabsAfter`: Close tabs after `index` (This is also "Close tabs to the right")
## References
* This PR is being made to unblock @RahulRavishankar in #1912
## PR Checklist
* [x] I work here
* [ ] Tests added/passed
* [x] Requires documentation to be updated
* [ ] We should file an issue for "add an `index` param to `closeTab`" to add similar support to the close tab action
* [ ] We should file an issue for "make the `index` param to `closeOtherTabs`, `closeTabsAfter` optional" to make them both work on the _active_ tab when there's no `index` provided
## Validation Steps Performed
* _Verified that_ closing all tabs when I have the `index`'th tab selected _works as expected_
* _Verified that_ closing all tabs when I have a tab other than the `index`'th tab selected _works as expected_
* _Verified that_ closing tabs to the right when I have the `index`'th tab selected _works as expected_
* _Verified that_ closing tabs to the right when I have a tab other than the `index`'th tab selected _works as expected_
- This one has one caveat: for whatever reason, if you run this action when the tab that's currently focused is _before_ the `index` param, then the tabs will expand to fill the entire width of the tab row, until you mouse over them. Probably has something to do with tabs not resizing down until there's a mouse exit event.
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