In automatically generated PSA test cases, annotate the test cases that are
expected to be never executed due to a dependency that is not implemented.
This was already done for not-supported test cases and for key generation,
but not for positive test cases of key usage.
You can audit which mechanisms are detected as not-implemented with
```
grep -hEo 'DEPENDENCY_NOT_IMPLEMENTED_YET_\w+' tests/suites/*.data | sort -u
```
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
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