Look for the bundle we downloaded in the toolcache

The runner image ships with its own copy of CodeQL in the toolcache, so
checking whether the toolcache contains CodeQL at all does not tell us
anything about the bundle this test downloaded.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: d4c7b873-8278-4a36-b67c-6cc5ea3b2316

Author: henrymercer

.github/workflows/__per-language-bundle.yml

@@ -44,9 +44,11 @@ steps:
         echo "::error::The per-language bundle was added to the toolcache at $CODEQL_PATH."
         exit 1
       fi
-      if [ -d "$RUNNER_TOOL_CACHE/CodeQL" ]; then
-        echo "::error::The toolcache contains CodeQL, but no bundle should have been added to it."
-        ls -R "$RUNNER_TOOL_CACHE/CodeQL"
+      # The runner image ships with its own CodeQL in the toolcache, so look for the version we
+      # downloaded rather than for CodeQL in general.
+      cached_version="$RUNNER_TOOL_CACHE/CodeQL/0.0.0-20260825"
+      if [ -d "$cached_version" ]; then
+        echo "::error::The per-language bundle was added to the toolcache at $cached_version."
         exit 1
       fi
   - uses: ./../action/analyze