tools/finalization: add SDK team as OWNERS

Update tools/finalization/OWNERS to include the entire SDK team; use the
SDK team's alias instead of explicitly listing each member.

Bug: 405872440
Test: presubmit
Ignore-AOSP-First: finalization is done internally
Change-Id: Ifcf472882cc37acb0375b2b9d41499b0873a0f69