Summary:
Cleans up trailing whitespaces and newlines at end of file.
Linter will be enabled in a followup

Test Plan: N/A

Reviewers: zasgar, michelle, #third_party_approvers

Reviewed By: michelle, #third_party_approvers

Differential Revision: https://phab.corp.pixielabs.ai/D9750

GitOrigin-RevId: 085c3bbbb3f97bc1b61c1009c7895b49b8e61012