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"
  },