SCM - implement scm/inputBox menu (#199147)

* SCM - fix regression related to the scm input box action button

* Single action working as expected

* Saving my work

* Fix enablement when there is only one action

* More polish when there are multiple actions

* WIP - Select default action

* Add proposal

* Another refactoring

* Update setting type

* Remove setting, store last executed command

* Revert code that was used for testing

* Fix compilation errors

* Remove test commands

extensions/git/package.json

@@ -25,7 +25,8 @@
     "timeline",
     "contribMergeEditorMenus",
     "scmInputBoxActionButton",
-    "scmInputBoxValueProvider"
+    "scmInputBoxValueProvider",
+    "contribSourceControlInputBoxMenu"
   ],
   "categories": [
     "Other"