ci: enable e2e/smoke on bazel6

Author: jbedard

.bcr/presubmit.yml

@@ -1,7 +1,7 @@
 bcr_test_module:
     module_path: 'e2e/smoke'
     matrix:
-        bazel: ['7.x', '6.x']
+        bazel: ['8.x', '7.x']
         platform: ['debian10', 'macos', 'ubuntu2004', 'windows']
     tasks:
         run_tests:

.github/workflows/ci.yaml

@@ -86,10 +86,6 @@ jobs:
                       bazel-version:
                           major: 7
                       bzlmod: 1
-                    # Don't test root workspace with Bazel 6 to reduce the size of the test matrix
-                    - bazel-version:
-                          major: 6
-                      folder: .
                     # Don't test non-bzlmod with Bazel 6 to reduce the size of the test matrix
                     - bazel-version:
                           major: 6
@@ -100,7 +96,7 @@ jobs:
                     # Don't test root workspace with non-bzlmod
                     - bzlmod: 0
                       folder: .
-                    # e2e/smoke broken with bazel6
+                    # e2e/smoke broken with bazel6 bzlmod
                     - bazel-version:
                           major: 6
                       folder: e2e/smoke