Swift: Unified handling of in-tree extractor packs.

swift/.gitignore

@@ -1,6 +1,3 @@
-# directory created by bazel run //swift:create-extractor-pack
-/extractor-pack
-
 # output files created by running tests
 *.o
 

swift/actions/run-ql-tests/action.yml

@@ -20,7 +20,6 @@ runs:
         codeql test run \
           --threads=0 \
           --ram 50000 \
-          --search-path "${{ github.workspace }}/swift/extractor-pack" \
           --check-databases \
           --check-unused-labels \
           --check-repeated-labels \