[tests][EZ] Cleanup mentions of unsupported env-modes in test script
[tests][EZ] Cleanup mentions of unsupported env-modes in test script

Summary:
Changelog: [internal]

Remove all mentions of -e and -w flag for SSA-env and constrain-writes, since they are no longer tested.

Reviewed By: panagosg7

Differential Revision: D38558791

fbshipit-source-id: 6713c241bcc2565d68ef5180a5fac298e424c014

mroch/flow,facebook/flow,mroch/flow,mroch/flow,mroch/flow,facebook/flow,facebook/flow,mroch/flow,facebook/flow,facebook/flow,facebook/flow,facebook/flow,mroch/flow,mroch/flow