fix: extract only required test databases for integration tests

The default (integration) scope was extracting all tools/test databases
for all 10 languages (~60 databases) when only 7 specific tools
databases plus javascript/examples are referenced by client integration
test fixtures.

Replace the blanket 'for lang in all languages' loop with an explicit
list of the 7 tools/test directories actually used:
  - cpp/tools/test/{CallGraphFrom,CallGraphFromTo,CallGraphTo}
  - javascript/tools/test/CallGraphFromTo
  - python/tools/test/CallGraphFromTo
  - rust/tools/test/{CallGraphFrom,PrintAST}

This restores the performance fix from main where integration scope
was intentionally minimal, and avoids a significant CI time regression
from extracting ~53 unnecessary databases.

Author: data-douser

.github/workflows/client-integration-tests.yml

@@ -99,7 +99,8 @@ jobs:
         run: ./server/scripts/install-packs.sh
 
       ## Extract test databases used in the integration tests.
-      ## Defaults to integration scope (javascript/examples + all tools databases).
+      ## Defaults to integration scope (javascript/examples + specific tools
+      ## databases referenced by integration test fixtures).
       ## Query unit tests auto-extract their own databases via `codeql test run`.
       - name: MCP Integration Tests - Extract test databases
         shell: bash