Key Usage Enablement for Ent-Feature CMPv2

[kitography]

Description

KeyUsage added as a field to intermediate and root certificates.
This enables ent-feature for CMPv2 to work.
https://github.com/hashicorp/vault-enterprise/pull/6492/files#

TODO only if you're a HashiCorp employee

• Not a backport
• Not a security
• ENT Breakage: If this PR either 1) removes a public function OR 2) changes the signature
  of a public function, even if that change is in a CE file, double check that
  applying the patch for this PR to the ENT repo and running tests doesn't
  break any tests. Sometimes ENT only tests rely on public functions in CE
  files. - PR already exists
• Jira: If this change has an associated Jira, it's referenced either
  in the PR description, commit message, or branch name.
• ENT PR: If this change has an associated ENT PR, please link it in the
  description. Also, make sure the changelog is in this PR, not in your ENT PR.

[github-actions]

CI Results:
All Go tests succeeded! ✅

[github-actions]

Build Results:
All builds succeeded! ✅

[sgmiller]

Can you go ahead and add the docs updates for this?

[kitography]

Can you go ahead and add the docs updates for this?

Docs are added.

[stevendpclark]

👍