RFR: 8349759: Fix CertificateBuilder and SimpleOCSPServer test utilities to support PQC algorithms

[Sean Mullan]

On Tue, 11 Feb 2025 17:50:45 GMT, Jamil Nimeh <jnimeh at openjdk.org> wrote:

> This fix makes some minor changes to the internals of the `CertificateBuilder` and `SimpleOCSPServer` test classes.  They would break when ML-DSA was selected as key and signing algorithms.  Also RSASSA-PSS works better now with these changes.  I've also taken this opportunity to do some cleanup on CertificateBuilder and added a method which uses a default signing algorithm based on the key, so the `build()` method no longer needs to provide that algorithm (though one can if they wish for things like RSA signatures if they want a different message digest in the signature).

Bug needs a `noreg-self` label.

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PR Comment: https://git.openjdk.org/jdk/pull/23566#issuecomment-2657471939