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

Test Plan: existing

Reviewers: michelle, vihang, #third_party_approvers

Reviewed By: vihang, #third_party_approvers

Differential Revision: https://phab.corp.pixielabs.ai/D8279

GitOrigin-RevId: 98163b1f8ccfbfc5526603b9c78c860a0957f6d7