rsa_kmgmt: Return OSSL_PKEY_PARAM_DEFAULT_DIGEST for unrestricted PSS keys

Add a testcase to the test_req covering the issue.

Fixes #13957

Reviewed-by: Richard Levitte <lev

rsa_kmgmt: Return OSSL_PKEY_PARAM_DEFAULT_DIGEST for unrestricted PSS keys

Add a testcase to the test_req covering the issue.

Fixes #13957

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/13967)

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