fix: MODULE.bazel.lock conflicts

See bazelbuild/bazel#20369

While working on refactoring, I kept hitting rebase conflicts due to
issues with the MODULE lock. I guess it's because the Bazel version in
e2e tests is much lower than the current one with the fix (7.2) but
still, I don't think it adds much to have the lock in e2e testing.

.gitignore

@@ -1,3 +1,6 @@
+# ignoring e2e MODULE.bazel.lock for the time being
+# see https:/bazelbuild/bazel/issues/20369
+e2e/smoke/MODULE.bazel.lock
 bazel-*
 .bazelrc.user
 .idea/