Summary:
Fixes golang setup to run goimports.
Depends on D3730.

Test Plan: N/A

Reviewers: michelle, nserrino, philkuz, #engineering

Reviewed By: michelle, #engineering

Differential Revision: https://phab.corp.pixielabs.ai/D3731

GitOrigin-RevId: 0b10c4cd8d82d30dc20a35df031d5bf1188029f2