Remove bcr_test_module stanza

This stanza shouldn't be here as we expect to build these projects via an anonymous module.

PiperOrigin-RevId: 791242354

Author: kevinoconnor7

.bcr/presubmit.yml

@@ -1,13 +1,12 @@
-bcr_test_module:
-  matrix:
-    platform:
-      - macos
-      - ubuntu2004
-    bazel:
-      - 8.x
-  tasks:
-    run_tests:
-      platform: ${{ platform }}
-      bazel: ${{ bazel }}
-      build_targets:
-        - '@elemental2//:all'
+matrix:
+  platform:
+    - macos
+    - ubuntu2004
+  bazel:
+    - 8.x
+tasks:
+  run_tests:
+    platform: ${{ platform }}
+    bazel: ${{ bazel }}
+    build_targets:
+      - '@elemental2//:all'