Make the sentry_env a bit smarter

cura_app.py

@@ -29,9 +29,13 @@ parser.add_argument("--debug",
 known_args = vars(parser.parse_known_args()[0])
 
 if with_sentry_sdk:
-    sentry_env = "production"
-    if ApplicationMetadata.CuraVersion == "master":
+    sentry_env = "unknown"  # Start off with a "IDK"
+    if hasattr(sys, "frozen"):
+        sentry_env = "production"  # A frozen build is a "real" distribution.
+    elif ApplicationMetadata.CuraVersion == "master":
         sentry_env = "development"
+    elif "beta" in ApplicationMetadata.CuraVersion or "BETA" in ApplicationMetadata.CuraVersion:
+        sentry_env = "beta"
     try:
         if ApplicationMetadata.CuraVersion.split(".")[2] == "99":
             sentry_env = "nightly"