Draft: Set ENABLE_PUMA_NAKAYOSHI_FORK to true

What does this MR do?

Enables nakayoshi_fork for Puma.

Because the related incident was resolved (gitlab-com/gl-infra/production#3370 (closed)) and the source of the issue was patched (gitlab!52177 (merged)), and we also established a single name for the env variable(gitlab-development-kit!1775 (diffs), gitlab-org/build/CNG!587 (diffs), !4941 (diffs)), we are ready to set ENABLE_PUMA_NAKAYOSHI_FORK: "true" by default.

See: gitlab#288042 (comment 494061932)

Related:

• gitlab-com/gl-infra/k8s-workloads/gitlab-com!652 (merged)
• gitlab-org/charts/gitlab!1795 (closed)
• gitlab-development-kit!1784 (closed)

Checklist

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