Disable Fips/OpenSSL Rubocop by default

What does this MR do and why?

With !88469 (merged), the Ruby Digest modules will automatically use the OpenSSL equivalents in FIPS mode. We don't need to enforce this as a static lint, nor can we reasonably expect all upstream dependencies to do the same.

There may also be slight advantange for the Ruby code to run without the need for OpenSSL.

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