Add external testing with oqsprovider

Including running the oqsprovider external test in the
CI external test build.

Reviewed-by: Richard Levitte <levitte@openssl.org>
Revie

Add external testing with oqsprovider

Including running the oqsprovider external test in the
CI external test build.

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/17832)

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