[Cutlass] Use env var for EVT flag

[mlazos]

Swaps out hard flag for environment variable in inductor config.

cc @voznesenskym @penguinwu @EikanWang @jgong5 @Guobing-Chen @XiaobingSuper @zhuhaozhe @blzheng @wenzhe-nrv @jiayisunx @ipiszy @chenyang78 @kadeng @muchulee8 @amjames @chauhang @aakhundov

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✅ You can merge normally! (1 Unrelated Failure)

As of commit 90a1f40 with merge base f2af30f ():

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• inductor / cuda12.8-py3.10-gcc9-sm86 / test (inductor_torchbench, 2, 2, linux.g5.4xlarge.nvidia.gpu) (gh) (trunk failure)
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[henrylhtsang]

@pytorchbot merge

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