Add groundwork to easily all-enable bazel-mode

This will make it easy to change a "false" boolean to "true" to push
`--bazel-mode` by default for all users.

Users may disable bazel-by-default with BUILD_BROKEN_DISABLE_BAZEL, and
bazel is disabled by default on Darwin hosts (due to lack of test
coverage).

Bug: 254628592
Bug: 254084584
Test: Presubmits
Test: Presubmits for aosp/2263623
Change-Id: Iec712119e06ca8ec93028207d88277f879184cc2
diff --git a/tests/lib.sh b/tests/lib.sh
index 006186a..e40f0ad 100644
--- a/tests/lib.sh
+++ b/tests/lib.sh
@@ -82,10 +82,10 @@
 }
 
 function create_mock_soong {
+  create_mock_bazel
   copy_directory build/blueprint
   copy_directory build/soong
   copy_directory build/make/tools/rbcrun
-  copy_directory prebuilts/bazel/common/proto
 
   symlink_directory prebuilts/sdk
   symlink_directory prebuilts/go