google / OpenSK / 9779569975

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Fixes and moves the SHA256 busy check (#689)

Inside `libraries/opensk`, we want to preserve the property that there
are never two SHA256 hashes calculates in parallel. This is useful to
support hardware crypto that can't swap out its state.

To check this property, there was an assertion in `libraries/crypto`.
However, the assertion

- didn't work,
- should have been in opensk instead
- and should run in tests, but not when deployed.

Since Rust runs tests in parallel, this PR makes sure that the assertion
only fails if two SHA256 are calculated within one thread.

Fixes #688

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