Replaced moment and dayjs with luxon

Signed-off-by: Vannarath Poeu <vannarath.poeu@gmail.com>

plugins/cost-insights/package.json

@@ -41,9 +41,8 @@
     "@types/react": "^16.9",
     "@types/recharts": "^1.8.14",
     "classnames": "^2.2.6",
-    "dayjs": "^1.9.4",
     "history": "^5.0.0",
-    "moment": "^2.27.0",
+    "luxon": "^1.26.0",
     "pluralize": "^8.0.0",
     "qs": "^6.9.4",
     "react": "^16.13.1",