Bazel: add --build_tests_only in swift CI

Author: redsun82

swift/actions/build-and-test/action.yml

@@ -44,10 +44,6 @@ runs:
         mkdir -p bazel-cache/{repository,disk}
         echo build --repository_cache=bazel-cache/repository --disk_cache=bazel-cache/disk > local.bazelrc
         echo test --test_output=errors >> local.bazelrc
-    # - name: Print unextracted entities
-    #   shell: bash
-    #   run: |
-    #     bazel run //swift/extractor/print_unextracted
     - uses: ./swift/actions/share-extractor-pack
     - name: Build Swift extractor
       shell: bash
@@ -62,7 +58,7 @@ runs:
       if: ${{ github.event_name == 'pull_request' }}
       shell: bash
       run: |
-        bazel test //swift/...
+        bazel test --build_tests_only //swift/...
     - name: Evict bazel cache
       if: ${{ github.event_name != 'pull_request' }}
       shell: bash