Add uuidv7 support for to Gitlab::Utils gem

What does this MR do and why?

Add uuidv7 support for to Gitlab::Utils gem

Be used in langgraph integration

This fails some tests as ruby 3.2.x doesn't have it (what we use in dotcom) but 3.3.x introduced it. We shall have this for some time.

References

• Related to Fix failing duo_workflow specs (#560512 - closed)
• We've ported the securerandom commit to a library in gitlab as is.
• https://docs.gitlab.com/development/gems/

How to set up and validate locally

Specs in gems/gitlab-utils

bundle exec rake rubocop
bundle exec rake spec

In rails console bin/rails c run

> Gitlab::Utils.uuid_v7
=> "019904a6-2110-7eb2-b4e8-428d11b4e26c"

Compare to what a ruby 3.3.x gives

> SecureRandom.uuid_v7
=> "019904a6-705d-7a9f-b1ff-aad4615bced5"

MR acceptance checklist

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