Exclude EVP_DigestSign and EVP_DigestVerify related APIs from the FIPS

Exclude EVP_DigestSign and EVP_DigestVerify related APIs from the FIPS
provider.

Revert changes to m_sigver.c related to #ifdef FIPS_MODULE and exclude
the file using build.info instead.

Also exclude these calls inside EVP_DigestUpdate() within the FIPS
provider since this API should only be used for self testing digests.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/25570)