[native] Ignore landing in Flow config

Summary: A change made to landing code caused native Flow to fail. It looks like we're ignoring other projects there so adding landing makes sense.

Test Plan: With changes from D7217 run Flow in native and check if it works correctly.

Reviewers: bartek, kamil, marcin

Reviewed By: bartek, marcin

Subscribers: ashoat, atul

Differential Revision: https://phab.comm.dev/D7231