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Fix sanity checks for patch workflow

Description

Fix sanity checks for patch workflow

Summary:
Ref T7604. Ref T8307. This was broken in D12962 because I only tested arc patch --arcbundle. Furthermore, this particular sanity check doesn't actually do anything now (see T8307).

Test Plan:
Ran arc patch --nobranch D12971 successfully.

Auditors: epriestley