fix: resolve false positives for ArtStation, GeeksforGeeks, and LushStories

- ArtStation: Add urlProbe using the JSON API endpoint
  (https://www.artstation.com/users/{}.json) which returns proper
  404 for non-existing users, instead of the main page which
  returns 200 for both existing and non-existing profiles.
  Closes #2714

- GeeksforGeeks: Switch from status_code to message detection.
  Both existing and non-existing profiles return HTTP 200, but
  non-existing profiles have "false" in the page title.
  Closes #2782

- LushStories: Switch from status_code to response_url detection.
  Non-existing profiles redirect (302) to /login while existing
  profiles return 200. Closes #2371

sherlock_project/resources/data.json

@@ -159,6 +159,7 @@
     "errorType": "status_code",
     "url": "https://www.artstation.com/{}",
     "urlMain": "https://www.artstation.com/",
+    "urlProbe": "https://www.artstation.com/users/{}.json",
     "username_claimed": "Blue"
   },
   "Asciinema": {
@@ -952,7 +953,8 @@
     "username_claimed": "blue"
   },
   "GeeksforGeeks": {
-    "errorType": "status_code",
+    "errorMsg": "false   | GeeksforGeeks Profile",
+    "errorType": "message",
     "url": "https://auth.geeksforgeeks.org/user/{}",
     "urlMain": "https://www.geeksforgeeks.org/",
     "username_claimed": "adam"
@@ -1526,7 +1528,8 @@
     "username_claimed": "lottiefiles"
   },
   "LushStories": {
-    "errorType": "status_code",
+    "errorType": "response_url",
+    "errorUrl": "https://www.lushstories.com/login",
     "isNSFW": true,
     "url": "https://www.lushstories.com/profile/{}",
     "urlMain": "https://www.lushstories.com/",