test: fetching proper signature provider for non-exportable keys

Co-author: Selva Nair <selva.nair@gmail.com>

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Richard L

test: fetching proper signature provider for non-exportable keys

Co-author: Selva Nair <selva.nair@gmail.com>

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/16725)

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