Tooltip keybinding hints (#5252)

* Make keybinding hint font-size dynamic to parent font-size

* Add keybinding hint support to Tooltip

* Move `IconButton` to `keybindingHint`

* Add `small` size and update design of `onEmphasis` variant

* Fix unit tests

* Add changeset

* Update story IDs in JSON

* Update test config

* Reduce right spacing

* Still not quite right on the spacing...

* Revert deps

* test(vrt): update snapshots

---------

Co-authored-by: iansan5653 <[email protected]>

Author: iansan5653

.changeset/cyan-glasses-sit.md

@@ -0,0 +1,5 @@
+---
+"@primer/react": minor
+---
+
+Adds `keybindingHint` prop to `TooltipV2` and `IconButton`, updates `onEmphasis` design variant for `KeybindingHint`, and adds `size` prop with `small` option to `KeybindingHint`.