fix: remove duplicate Jest configuration from package.json

Remove the jest configuration section from package.json to resolve
the "Multiple configurations found" error. All Jest configuration
is now centralized in jest.config.js.

This fixes the CI/CD test execution error where Jest was finding
configurations in both jest.config.js and package.json.

Author: JesperDramsch

package.json

@@ -34,41 +34,5 @@
     "jest-environment-jsdom": "^29.7.0",
     "jest-localstorage-mock": "^2.4.26",
     "luxon": "^3.4.4"
-  },
-  "jest": {
-    "testEnvironment": "jsdom",
-    "setupFilesAfterEnv": [
-      "<rootDir>/tests/frontend/setup.js"
-    ],
-    "moduleNameMapper": {
-      "\\.(css|less|scss|sass)$": "<rootDir>/tests/frontend/__mocks__/styleMock.js",
-      "\\.(jpg|jpeg|png|gif|svg)$": "<rootDir>/tests/frontend/__mocks__/fileMock.js"
-    },
-    "collectCoverageFrom": [
-      "static/js/**/*.js",
-      "!static/js/**/*.min.js",
-      "!static/js/jquery*.js",
-      "!static/js/bootstrap*.js",
-      "!static/js/popper*.js",
-      "!static/js/lunr*.js",
-      "!static/js/store*.js",
-      "!static/js/luxon.js",
-      "!static/js/js-year-calendar*.js",
-      "!static/js/ouical*.js"
-    ],
-    "coverageThreshold": {
-      "global": {
-        "branches": 70,
-        "functions": 75,
-        "lines": 80,
-        "statements": 80
-      }
-    },
-    "testMatch": [
-      "**/tests/frontend/**/*.test.js"
-    ],
-    "globals": {
-      "IS_TESTING": true
-    }
   }
 }