build: disable RBE for CI

This appears to be broken due to a recent configuration change to improve security and it's not worth fixing for an LTS branch.

Author: dgp1130

.circleci/bazel.linux.rc

@@ -2,4 +2,5 @@
 # https://docs.bazel.build/versions/master/guide.html#bazelrc-syntax-and-semantics
 import %workspace%/.circleci/bazel.common.rc
 
-build --config=remote
+# Disabled because RBE for v18 was broken due to configuration changes for security reasons.
+# build --config=remote