Remove frontend JS lint (#2063)

Currently, frontend linter is failing due to lint scripts 
checking javascript files, the last of which has been 
removed in PR #2053.

Lets update the lint command to exclude javascript 
files front the check.

frontend/package.json

@@ -6,9 +6,9 @@
   "scripts": {
     "serve": "vue-cli-service serve",
     "build": "vue-cli-service build",
-    "lint": "eslint src/**/*.{ts,js,vue} cypress/tests/**/*.js cypress/support.js && stylelint ./src/**/*.{vue,scss} && npm run puglint",
+    "lint": "eslint src/**/*.{ts,vue} cypress/tests/**/*.js cypress/support.js && stylelint ./src/**/*.{vue,scss} && npm run puglint",
     "devbuild": "vue-cli-service build --mode development",
-    "lintfix": "eslint --fix src/**/*.{ts,js,vue} cypress/tests/**/*.js cypress/support.js && stylelint --fix ./src/**/*.{vue,scss}",
+    "lintfix": "eslint --fix src/**/*.{ts,vue} cypress/tests/**/*.js cypress/support.js && stylelint --fix ./src/**/*.{vue,scss}",
     "puglint": "pug-lint-vue src",
     "serveOpen": "vue-cli-service serve --open"
   },