MM-54191 Change how menu item click handlers are triggered after menus fully close (#24335)

* MM-54191 Change how menu item click handlers are triggered after menus fully close

* Switch menu items to use onClick instead of onMouseDown

* Add unit tests for menu keyboard navigation and opening modals

* Fix missing use of useMenuContextValue

* Remove unneeded ?.

* Fix unrelated test broken by @testing-library/user-event update

webapp/package-lock.json

@@ -152,7 +152,7 @@
         "@redux-devtools/extension": "3.2.3",
         "@testing-library/jest-dom": "5.16.4",
         "@testing-library/react": "12.1.4",
-        "@testing-library/user-event": "12.1.4",
+        "@testing-library/user-event": "13.5.0",
         "@types/bootstrap": "4.5.0",
         "@types/country-list": "2.1.0",
         "@types/enzyme": "3.10.11",
@@ -272,12 +272,12 @@
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     },
     "channels/node_modules/@testing-library/user-event": {
-      "version": "12.1.4",
-      "resolved": "https://registry.npmjs.org/@testing-library/user-event/-/user-event-12.1.4.tgz",
-      "integrity": "sha512-vd5s43lNfyq/JEr8ndQmS+An6dEVUmjW9zqtpmMHU+rrPMaHLrUIlWZ9wDE8ALS/dFMsu6U00A5X/7Dv/2tWnw==",
+      "version": "13.5.0",
+      "resolved": "https://registry.npmjs.org/@testing-library/user-event/-/user-event-13.5.0.tgz",
+      "integrity": "sha512-5Kwtbo3Y/NowpkbRuSepbyMFkZmHgD+vPzYB/RJ4oxt5Gj/avFFBYjhw27cqSVPVw/3a67NK1PbiIr9k4Gwmdg==",
       "dev": true,
       "dependencies": {
-        "@babel/runtime": "^7.10.2"
+        "@babel/runtime": "^7.12.5"
       },
       "engines": {
         "node": ">=10",
@@ -35656,7 +35656,7 @@
         "@stripe/stripe-js": "1.41.0",
         "@testing-library/jest-dom": "5.16.4",
         "@testing-library/react": "12.1.4",
-        "@testing-library/user-event": "12.1.4",
+        "@testing-library/user-event": "13.5.0",
         "@tippyjs/react": "4.2.6",
         "@types/bootstrap": "4.5.0",
         "@types/color-hash": "1.0.2",
@@ -35840,12 +35840,12 @@
           }
         },
         "@testing-library/user-event": {
-          "version": "12.1.4",
-          "resolved": "https://registry.npmjs.org/@testing-library/user-event/-/user-event-12.1.4.tgz",
-          "integrity": "sha512-vd5s43lNfyq/JEr8ndQmS+An6dEVUmjW9zqtpmMHU+rrPMaHLrUIlWZ9wDE8ALS/dFMsu6U00A5X/7Dv/2tWnw==",
+          "version": "13.5.0",
+          "resolved": "https://registry.npmjs.org/@testing-library/user-event/-/user-event-13.5.0.tgz",
+          "integrity": "sha512-5Kwtbo3Y/NowpkbRuSepbyMFkZmHgD+vPzYB/RJ4oxt5Gj/avFFBYjhw27cqSVPVw/3a67NK1PbiIr9k4Gwmdg==",
           "dev": true,
           "requires": {
-            "@babel/runtime": "^7.10.2"
+            "@babel/runtime": "^7.12.5"
           }
         },
         "@types/react-select": {