fix(bcr): add mandatory gazelle bcr presubmit attrs (#1894)

The same as in f1d1732.

Fixes that were needed in
[bazel/bazel-central-registry#2019](bazelbuild/bazel-central-registry#2019).

Author: aignas

.bcr/gazelle/presubmit.yml

@@ -16,10 +16,12 @@ bcr_test_module:
   module_path: "../examples/bzlmod_build_file_generation"
   matrix:
     platform: ["debian11", "macos", "ubuntu2004", "windows"]
+    bazel: [6.x, 7.x]
   tasks:
     run_tests:
       name: "Run test module"
       platform: ${{ platform }}
+      bazel: ${{ bazel }}
       build_targets:
         - "//..."
         - ":modules_map"