Add missing types in pull_request and workflow_run events according to documentation (#3457)

Author: chouetz

src/schemas/json/github-workflow.json

@@ -1257,6 +1257,8 @@
                       "ready_for_review",
                       "locked",
                       "unlocked",
+                      "milestoned",
+                      "demilestoned",
                       "review_requested",
                       "review_request_removed",
                       "auto_merge_enabled",
@@ -1636,7 +1638,7 @@
                   "$ref": "#/definitions/types",
                   "items": {
                     "type": "string",
-                    "enum": ["requested", "completed"]
+                    "enum": ["requested", "completed", "in_progress"]
                   },
                   "default": ["requested", "completed"]
                 },