Update dependency @angular/core to v15

frontend/package.json

@@ -12,14 +12,14 @@
   },
   "private": true,
   "dependencies": {
-    "@angular/animations": "~15.0.0",
+    "@angular/animations": "~14.2.0",
     "@angular/cdk": "^15.0.0",
-    "@angular/common": "~15.0.0",
+    "@angular/common": "~14.2.0",
-    "@angular/compiler": "~15.0.0",
+    "@angular/compiler": "~14.2.0",
     "@angular/core": "~15.0.0",
     "@angular/forms": "~15.0.0",
     "@angular/material": "^15.0.0",
-    "@angular/platform-browser": "~15.0.0",
+    "@angular/platform-browser": "~14.2.0",
     "@angular/platform-browser-dynamic": "~15.0.0",
     "@angular/router": "~15.0.0",
     "bootstrap": "^5.1.3",
@@ -29,18 +29,18 @@
     "zone.js": "~0.12.0"
   },
   "devDependencies": {
-    "@angular-devkit/build-angular": "~15.1.0",
+    "@angular-devkit/build-angular": "~15.0.0",
     "@angular-eslint/builder": "15.1.0",
-    "@angular-eslint/eslint-plugin": "15.1.0",
+    "@angular-eslint/eslint-plugin": "14.1.2",
     "@angular-eslint/eslint-plugin-template": "15.1.0",
     "@angular-eslint/schematics": "15.1.0",
     "@angular-eslint/template-parser": "15.1.0",
-    "@angular/cli": "~15.0.0",
+    "@angular/cli": "~14.2.0",
-    "@angular/compiler-cli": "~15.0.0",
+    "@angular/compiler-cli": "~14.2.0",
     "@types/jasmine": "~4.3.0",
     "@types/node": "^18.0.0",
-    "@typescript-eslint/eslint-plugin": "5.46.1",
+    "@typescript-eslint/eslint-plugin": "5.39.0",
-    "@typescript-eslint/parser": "5.46.1",
+    "@typescript-eslint/parser": "5.40.1",
     "eslint": "^8.15.0",
     "jasmine-core": "~4.5.0",
     "karma": "~6.4.0",