[desktop] Enable flow in the desktop workspace

Summary:
ENG-2219
Adds flow support in the desktop workspace.

Test Plan:

• Run flow in desktop
• Check if lint-staged fails when trying to commit file with type errors

Reviewers: tomek, atul, ashoat

Reviewed By: ashoat

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D6174