[PM-26185] new app metric card (#16658)

* new messages.json keys

* button changes for dirt activity card

* dummy data

* newApplicationsCount and temp toast

* Added third dirt-activity-card component after the existing two cards

* added newApplications to setAllAppsReportSummary

* make button smaller

* cleanup/nice-to-haves

* remove comment

* simplify activity card icon logic to use nullable iconClass

* use buttonText presence to determine button display in activity card

* apps needing review card
- I think accidentally deleted when resolving merge conflicts

* buttonClick.observed && buttonText

apps/web/src/locales/en/messages.json

@@ -280,6 +280,24 @@
   "totalApplications": {
     "message": "Total applications"
   },
+  "applicationsNeedingReview": {
+    "message": "Applications needing review"
+  },
+  "newApplicationsWithCount": {
+    "message": "$COUNT$ new applications",
+    "placeholders": {
+      "count": {
+        "content": "$1",
+        "example": "13"
+      }
+    }
+  },
+  "newApplicationsDescription": {
+    "message": "Review new applications to mark as critical and keep your organization secure"
+  },
+  "reviewNow": {
+    "message": "Review now"
+  },
   "unmarkAsCritical": {
     "message": "Unmark as critical"
   },