Merge pull request github#19014 from michaelnebel/csharp/ccr-useless-gethashcode-all

C#: Add `cs/useless-gethashcode-call` to the CCR suite.

Author: michaelnebel

csharp/ql/src/codeql-suites/csharp-ccr.qls

@@ -10,3 +10,4 @@
       - cs/call-to-object-tostring
       - cs/local-not-disposed
       - cs/constant-condition
+      - cs/useless-gethashcode-call