Merge cos-sdk into ToT

Includes changes for the most recent ChromeOS merge.

BUG=b/257271340
TEST=presubmit
RELEASE_NOTE=None

Change-Id: I19a6db3382df4a028858411c95c0ea2d35d093ca
tree: 5e1a872ac6cbb80aea2e5f9aa1f7753286beb8e3
  1. acct-group/
  2. acct-user/
  3. eclass/
  4. metadata/
  5. profiles/
  6. OWNERS
  7. PRESUBMIT.cfg