Summary: Now that the repos are public we can refer to them using bazel directly instead of private submodules.

Test Plan: existing

Reviewers: vihang, michelle, oazizi, #third_party_approvers

Reviewed By: vihang, #third_party_approvers

Differential Revision: https://phab.corp.pixielabs.ai/D8283

GitOrigin-RevId: de45a66e6f7a5e53685bc51721b0a4de5b61a0e1