Upgrades: All old diagnostics are generated by the Java extractor

Author: igfoo

java/ql/lib/upgrades/37f33da42d2cffa6ad8b26feaa6beed1c5ce3149/diagnostics.ql

@@ -10,4 +10,4 @@ from
   Diagnostic d, int severity, string error_tag, string error_message, string full_error_message,
   Location l
 where diagnostics(d, severity, error_tag, error_message, full_error_message, l)
-select d, /* generated_by */ "", severity, error_tag, error_message, full_error_message, l
+select d, /* generated_by */ "CodeQL Java extractor", severity, error_tag, error_message, full_error_message, l