Summary: This enables the linter but does not fix all lint issues. We can fix then as shell files are edited.

Test Plan: `arc lint`

Reviewers: michelle, oazizi, philkuz, #engineering

Reviewed By: oazizi, #engineering

Differential Revision: https://phab.corp.pixielabs.ai/D2312

GitOrigin-RevId: ae7bda4e502adc2f836cbfc320cc2fcc3ae6c225