Feat: integration tests don't need stubbed WORKSPACE

[chickenandpork]

This PR will only land once:

• fix: look for MODULE.bazel in child repos to remove need for stub WORKSPACE bazel-contrib/rules_bazel_integration_test#416 pr similar merges
• MODULE.bazel version-bumps the bazel_dep to include where that fix shipped

...so this won't work for a while, but will keep an eye on it.

Testing

This was built and tested using a docker container generated form thin this repo:

docker run --rm -it \
    -v ~/src/rules_synology:/rules_synology \
    -v ~/src/rules_bazel_integration_test:/rules_bazel_integration_test \
    -w /rules_synology \
    ubuntu-x86:latest bash