Automatic merge from submit-queue

Revert "Avoid hard-coding list of Node Conditions"

* we don't know how other API consumers are using node conditions (there was no prior expectation that the scheduler would block on custom conditions)
* not all conditions map directly to schedulability (e.g. `MemoryPressure`/`DiskPressure`)
* not all conditions use True to mean "unschedulable" (e.g. `Ready`)

This reverts commit 511b2eca to avoid breaking existing API users and to avoid constraining future uses of the node conditions API