Refactoring: Rename KnownLanguage to BuiltInLanguage

Author: henrymercer

.github/workflows/update-bundle.yml

@@ -63,7 +63,7 @@ jobs:
         with:
           tools: https://github.com/github/codeql-action/releases/download/${{ github.event.release.tag_name }}/codeql-bundle-linux64.tar.gz
 
-      - name: Update known languages
+      - name: Update built-in languages
         uses: actions/github-script@v8
         env:
           CODEQL_PATH: ${{ steps.setup-codeql.outputs.codeql-path }}