integration-tests: update readme, try to fix ci build (#3791)

.circleci/config.yml

@@ -590,7 +590,6 @@ jobs:
   integration-tests:
     machine:
       image: ubuntu-2204:2022.07.1
-      docker_layer_caching: true
     environment:
       DOCKER_BUILDKIT: 1
     parallelism: 3

integration-tests/README.md

 # @eth-optimism/integration-tests
 
+Note that these tests are ran against the legacy system, see `op-e2e` for
+the bedrock test suite.
+
 ## Setup
 
 Follow installation + build instructions in the [primary README](../README.md).
@@ -48,4 +51,4 @@ Actor tests use the same environment variables as the integration tests, so set
 already. Then, run `yarn test:actor <args>` to run the tests. Note that it will be **very expensive** to run the actor
 tests against mainnet, and that the tests can take a while to complete.
 
-See [actor-tests/README.md](actor-tests/README.md) for information on actor tests. 
\ No newline at end of file
+See [actor-tests/README.md](actor-tests/README.md) for information on actor tests.