Summary: As direct mode is now being removed vizier no longer need a certmgr service. Remove certmgr.

Test Plan: skaffold deploy vizier

Reviewers: michelle, nserrino, zasgar

Reviewed By: michelle

JIRA Issues: PP-3334
Signed-off-by: Vihang Mehta <vihang@pixielabs.ai>

Differential Revision: https://phab.corp.pixielabs.ai/D11072

GitOrigin-RevId: 29b5d317eea5050a395f42140af07bf7676d418a