QL4QL: Remove redundant CODEQL_THREADS setting from the database stats workflow

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: henrymercer

.github/workflows/ql-for-ql-dataset_measure.yml

@@ -17,8 +17,6 @@ permissions:
 
 jobs:
   measure:
-    env:
-      CODEQL_THREADS: 4 # TODO: remove this once it's set by the CLI
     strategy:
       matrix:
         repo: