Remove Luxon from codebase (#14448)

Fixes #14444 

We shouldn't have 2 libraries to manage dates, one is enough

package.json

@@ -46,7 +46,6 @@
     "lodash.pickby": "^4.6.0",
     "lodash.snakecase": "^4.1.1",
     "lodash.upperfirst": "^4.3.1",
-    "luxon": "^3.3.0",
     "microdiff": "^1.3.2",
     "moize": "^6.1.6",
     "patch-package": "^8.0.0",
@@ -142,7 +141,6 @@
     "@types/lodash.pickby": "^4.6.9",
     "@types/lodash.snakecase": "^4.1.7",
     "@types/lodash.upperfirst": "^4.3.7",
-    "@types/luxon": "^3.3.0",
     "@types/mailparser": "^3.4.6",
     "@types/ms": "^0.7.31",
     "@types/node": "^24.0.0",