Devicelab tests fail due to running on arm64 bots

[keyonghan]

https://chrome-internal-review.googlesource.com/c/infradata/config/+/4673717 enabled several arm64 bots in prod, and devicelab tests are scheduled to run on these bots, causing infra failures.

These bots are expected to run only arm64 tests validated in staging.

We need to enforce mac model for existing builders.

[keyonghan]

I tried ssh to these bots to quarantine, but somehow hit:

ssh flutter@flutter-devicelab-mac-42.mtv.corp.google.com
F0413 12:50:19.015105   66936 helper.go:392] Failed to initialize session: upgrading to websocket: bad status
kex_exchange_identification: Connection closed by remote host

[keyonghan]

To unblock the tree. Revert: https://chrome-internal-review.googlesource.com/c/infradata/config/+/4674204

[keyonghan]

DeviceLab tests have been switched to use os+cpu, instead of mac_model, and all tests have explicitly specified the correct dimensions. Closing.

[github-actions]

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